Worldwide Shipping
We offer shipping to most countries. Simply select your country once you have added items to your basket and you'll be shown an instant price for shipping without having to advance in to the check out process.

×

200,000+ Parts & Accessories
Our catalogue has grown extensively over the years and we now source a huge range of parts and accessories from a number of distributors from round the world.

×

Order Online Or By Phone 
We're more than happy to have customers order which ever way they prefer. If you'd like to discuss anything over the phone prior to ordering we'd be delighted to help you.

×

Simple Exchange Or Refund Policy 
We know when customers receive their orders there is always the possibility of needing to exchange or return items for a refund. Rest assured if you need to, we make it simple. See T&C's for more details.

×

Price Match Promise 
We offer a price match promise on all items we sell. Use the "Seen it cheaper?" option found on the product pages to request a price match.

×
ARH Custom Custom Motorcycle Parts and Accessories ARH Custom Custom Motorcycle Parts and Accessories
Shop by...
Your Vehicle Details
  • Or select your motorcycle


Price
Brand
Make
Availability

Cylinder Parts

Discover high-quality aftermarket Harley Davidson cylinder parts designed to enhance engine performance and reliability. Our extensive range includes cylinder studs, base nuts, head bolt kits, and cylinder base spacers, catering to Big Twins, Sportsters, and other Harley models. With a variety of sleek finishes, these parts provide a polished, custom look for your bike. Whether you're restoring a classic or upgrading a more recent model, ARH Custom has you covered. Shop now.
Showing 1 to 60 of 113 products in this section.
Sort by
Streethog Cylinder Head/Base Nut 7/16-20; high Torque Style, Provides Extra Clearance For Big Bore Cylinders Fits Stock Bore As Well in Stainless Steel For 1936-1984 B.T. Models (ARM773009)Streethog Cylinder Head/Base Nut 7/16-20; high Torque Style, Provides Extra Clearance For Big Bore Cylinders Fits Stock Bore As Well in Stainless Steel For 1936-1984 B.T. Models (ARM773009)

EU stock

Usually ships in 3-6 business days

All orders are shipped out of our UK premises. Estimated shipping date between 29 May and 3 Jun.

×

£9.54 inc.VAT
Streethog Cylinder Head/Base Acorn Nut 7/16-20 UNF in Polished Finish For 1948-1984 B.T. Models (ARM283009)Streethog Cylinder Head/Base Acorn Nut 7/16-20 UNF in Polished Finish For 1948-1984 B.T. Models (ARM283009)

EU stock

Usually ships in 3-6 business days

All orders are shipped out of our UK premises. Estimated shipping date between 29 May and 3 Jun.

×

£7.79 inc.VAT
S&S Cylinder Stud Set For Late 1985-1999 Evo B.T. & S&S Evo Crankcases Models (31-2321)S&S Cylinder Stud Set For Late 1985-1999 Evo B.T. & S&S Evo Crankcases Models (31-2321)

EU stock

Usually ships in 3-6 business days

All orders are shipped out of our UK premises. Estimated shipping date between 29 May and 3 Jun.

×

£92.33 inc.VAT
Colony Cylinder Head Bolt Kit 12 Point Domed Heads in Chrome Finish For Late 1985-1991 B.T., 1986-1991 XL Models (ARM995989)Colony Cylinder Head Bolt Kit 12 Point Domed Heads in Chrome Finish For Late 1985-1991 B.T., 1986-1991 XL Models (ARM995989)

EU stock

Usually ships in 3-6 business days

All orders are shipped out of our UK premises. Estimated shipping date between 29 May and 3 Jun.

×

£117.98 inc.VAT
Colony Head Bolt Kit OEM Style Including Washers in Zinc Finish For 1973-1985 XL Models (ARM918929)Colony Head Bolt Kit OEM Style Including Washers in Zinc Finish For 1973-1985 XL Models (ARM918929)

EU stock

Usually ships in 3-6 business days

All orders are shipped out of our UK premises. Estimated shipping date between 29 May and 3 Jun.

×

£42.86 inc.VAT
Colony Cylinder Base Nut Kit Hex In Chrome Finish For 1930-1978 B.T. Models (ARM982315)Colony Cylinder Base Nut Kit Hex In Chrome Finish For 1930-1978 B.T. Models (ARM982315)

EU stock

Usually ships in 3-6 business days

All orders are shipped out of our UK premises. Estimated shipping date between 29 May and 3 Jun.

×

£26.05 inc.VAT
Colony Cylinder Base Nut Kit, High-Torque No Washers, Provides Extra Space For Big Bore Cylinders But Fits Stock Bore Equally Well in Chrome Finish For 1936-1984 B.T. Models (ARM087105)Colony Cylinder Base Nut Kit, High-Torque No Washers, Provides Extra Space For Big Bore Cylinders But Fits Stock Bore Equally Well in Chrome Finish For 1936-1984 B.T. Models (ARM087105)

EU stock

Usually ships in 3-6 business days

All orders are shipped out of our UK premises. Estimated shipping date between 29 May and 3 Jun.

×

£34.73 inc.VAT
Colony Cylinder Base Nut Kit Acorn in Chrome Finish For 1957-1985 XL, 1929-1973 45 Inch SV Models (ARM811989)Colony Cylinder Base Nut Kit Acorn in Chrome Finish For 1957-1985 XL, 1929-1973 45 Inch SV Models (ARM811989)

EU stock

Usually ships in 3-6 business days

All orders are shipped out of our UK premises. Estimated shipping date between 29 May and 3 Jun.

×

£21.70 inc.VAT
S&S Head Bolt Kit in Black Oxide Coating Finish For 2018-2023 Softail & 2017-2023 Touring, Trikes Models (900-1006)S&S Head Bolt Kit in Black Oxide Coating Finish For 2018-2023 Softail & 2017-2023 Touring, Trikes Models (900-1006)

EU stock

Usually ships in 3-6 business days

All orders are shipped out of our UK premises. Estimated shipping date between 29 May and 3 Jun.

×

£177.80 inc.VAT
Colony Cylinder Head Bolt Kit 12 Point Domed Head in Chrome Finish For 1992-2017 B.T. (Excluding M8), 1992-2022 XL, 2008-2012 XR1200 Models (ARM006989)Colony Cylinder Head Bolt Kit 12 Point Domed Head in Chrome Finish For 1992-2017 B.T. (Excluding M8), 1992-2022 XL, 2008-2012 XR1200 Models (ARM006989)

EU stock

Usually ships in 3-6 business days

All orders are shipped out of our UK premises. Estimated shipping date between 29 May and 3 Jun.

×

£117.98 inc.VAT
Colony Cylinder Base Nut Kit Hex in Parkerized Finish For 1957-1985 XL, 1929-1973 45 Inch SV Models (ARM421989)Colony Cylinder Base Nut Kit Hex in Parkerized Finish For 1957-1985 XL, 1929-1973 45 Inch SV Models (ARM421989)

EU stock

Usually ships in 3-6 business days

All orders are shipped out of our UK premises. Estimated shipping date between 29 May and 3 Jun.

×

£15.55 inc.VAT
Colony Cylinder Base Lockwashers 7/16 in Parkerized Finish For 1930-1978 OHV & SV B.T., 1957-1986 XL Models (ARM721989)Colony Cylinder Base Lockwashers 7/16 in Parkerized Finish For 1930-1978 OHV & SV B.T., 1957-1986 XL Models (ARM721989)

EU stock

Usually ships in 3-6 business days

All orders are shipped out of our UK premises. Estimated shipping date between 29 May and 3 Jun.

×

£5.58 inc.VAT
S&S Cylinder Base Nuts 'High Torque' (8 Pack) No Washers, Provides Extra Space For Big Bore Cylinders But Fits Stock Bore Equally Well in Stainless Steel Finish For 1930-1984 B.T. Models (93-3063)S&S Cylinder Base Nuts 'High Torque' (8 Pack) No Washers, Provides Extra Space For Big Bore Cylinders But Fits Stock Bore Equally Well in Stainless Steel Finish For 1930-1984 B.T. Models (93-3063)

EU stock

Usually ships in 3-6 business days

All orders are shipped out of our UK premises. Estimated shipping date between 29 May and 3 Jun.

×

£94.16 inc.VAT
Colony Cylinder Base Nut Kit Hex Flanged in Black Parkerized Finish For 1979-1984 1340CC B.T. Models (ARM511989)Colony Cylinder Base Nut Kit Hex Flanged in Black Parkerized Finish For 1979-1984 1340CC B.T. Models (ARM511989)

EU stock

Usually ships in 3-6 business days

All orders are shipped out of our UK premises. Estimated shipping date between 29 May and 3 Jun.

×

£25.52 inc.VAT
Jims Forceflow Cylinder Head Cooler In Black For 2017-Up M8 Touring Models (5468)Jims Forceflow Cylinder Head Cooler In Black For 2017-Up M8 Touring Models (5468)

EU stock

Usually ships in 3-6 business days

All orders are shipped out of our UK premises. Estimated shipping date between 29 May and 3 Jun.

×

£531.90 inc.VAT
Gardner Westcott Head Bolt Kit 12 Point Stock & Big Bore in Chrome Finish For 1948-1984 B.T. Models (ARM786415)Gardner Westcott Head Bolt Kit 12 Point Stock & Big Bore in Chrome Finish For 1948-1984 B.T. Models (ARM786415)

EU stock

Usually ships in 3-6 business days

All orders are shipped out of our UK premises. Estimated shipping date between 29 May and 3 Jun.

×

£84.60 inc.VAT
Colony Cylinder Base Spacers in Chrome Finish For 1979-1984 1340CC B.T. Models (ARM014315)Colony Cylinder Base Spacers in Chrome Finish For 1979-1984 1340CC B.T. Models (ARM014315)

EU stock

Usually ships in 3-6 business days

All orders are shipped out of our UK premises. Estimated shipping date between 29 May and 3 Jun.

×

£27.59 inc.VAT
Colony Cylinder Base Stud Set 8-Pack For 1930-1977 B.T. Models (ARM002929)Colony Cylinder Base Stud Set 8-Pack For 1930-1977 B.T. Models (ARM002929)

EU stock

Usually ships in 3-6 business days

All orders are shipped out of our UK premises. Estimated shipping date between 29 May and 3 Jun.

×

£37.72 inc.VAT
Colony Cylinder Base Nut Kit Hex in Parkerized Finish For 1930-1978 B.T. Models (ARM801989)Colony Cylinder Base Nut Kit Hex in Parkerized Finish For 1930-1978 B.T. Models (ARM801989)

EU stock

Usually ships in 3-6 business days

All orders are shipped out of our UK premises. Estimated shipping date between 29 May and 3 Jun.

×

£17.65 inc.VAT
S&S Cycle Super Stock Heads 3.625 Bore O-Ring Style Dual Plug Cylinder Head Kit In Natural Aluminium Finish For Harley Davidson 1966-1978 Big Twin Models (90-1491)S&S Cycle Super Stock Heads 3.625 Bore O-Ring Style Dual Plug Cylinder Head Kit In Natural Aluminium Finish For Harley Davidson 1966-1978 Big Twin Models (90-1491)

US stock

Usually ships in 3-4 weeks

All orders are shipped out of our UK premises. Estimated shipping date between 16 Jun and 20 Jun.

×

£2,038.24 inc.VAT
Colony Cylinder Head Bolt Kit 12 Point Domed Head, External Thread in Chrome Finish For Early 1984 - Late 1985 B.T. Models (ARM895989)Colony Cylinder Head Bolt Kit 12 Point Domed Head, External Thread in Chrome Finish For Early 1984 - Late 1985 B.T. Models (ARM895989)

EU stock

Usually ships in 3-6 business days

All orders are shipped out of our UK premises. Estimated shipping date between 29 May and 3 Jun.

×

£32.04 inc.VAT
Colony Cylinder Base Studs 8x 3/8-16 To 3/8-24 x 1 13/16 Inch Stud For 1930-1973 45 Inch SV (Cylinder Base); 1965-1969 B.T. Models (ARM121179)Colony Cylinder Base Studs 8x 3/8-16 To 3/8-24 x 1 13/16 Inch Stud For 1930-1973 45 Inch SV (Cylinder Base); 1965-1969 B.T. Models (ARM121179)

EU stock

Usually ships in 3-6 business days

All orders are shipped out of our UK premises. Estimated shipping date between 29 May and 3 Jun.

×

£14.81 inc.VAT
S&S Cylinder Stud Set For 1999-2017 TCA/B Models (31-2340)S&S Cylinder Stud Set For 1999-2017 TCA/B Models (31-2340)

EU stock

Usually ships in 3-6 business days

All orders are shipped out of our UK premises. Estimated shipping date between 29 May and 3 Jun.

×

£92.33 inc.VAT
Colony Cylinder Base Nut Kit High-Torque in Black Finish For 1957-1985 XL, 1929-1973 45 Inch SV Models (ARM021989)Colony Cylinder Base Nut Kit High-Torque in Black Finish For 1957-1985 XL, 1929-1973 45 Inch SV Models (ARM021989)

EU stock

Usually ships in 3-6 business days

All orders are shipped out of our UK premises. Estimated shipping date between 29 May and 3 Jun.

×

£30.28 inc.VAT
Colony Cylinder Base Nut Kit Cap Style in Chrome Finish For 1930-1978 B.T. Models (ARM011989)Colony Cylinder Base Nut Kit Cap Style in Chrome Finish For 1930-1978 B.T. Models (ARM011989)

EU stock

Usually ships in 3-6 business days

All orders are shipped out of our UK premises. Estimated shipping date between 29 May and 3 Jun.

×

£23.94 inc.VAT
Colony Cylinder Base Nut Kit 'High Torque' No Washers, Provides Extra Space For Big Bore Cylinders But Fits Stock Bore Cylinders Equally Well in Black Oxide Finish For 1936-1984 B.T. Models (ARM675079)Colony Cylinder Base Nut Kit 'High Torque' No Washers, Provides Extra Space For Big Bore Cylinders But Fits Stock Bore Cylinders Equally Well in Black Oxide Finish For 1936-1984 B.T. Models (ARM675079)

EU stock

Usually ships in 3-6 business days

All orders are shipped out of our UK premises. Estimated shipping date between 29 May and 3 Jun.

×

£30.48 inc.VAT
S&S Cylinder Stud Set 8 Used in One Engine For 1986-2017 XL, 2008-2012 XR1200, S&S 100/107/113 Inch 4 Inch Bore Evo Engines Models (31-2331)S&S Cylinder Stud Set 8 Used in One Engine For 1986-2017 XL, 2008-2012 XR1200, S&S 100/107/113 Inch 4 Inch Bore Evo Engines Models (31-2331)

EU stock

Usually ships in 3-6 business days

All orders are shipped out of our UK premises. Estimated shipping date between 29 May and 3 Jun.

×

£71.76 inc.VAT
Jims Forceflow Cylinder Head Cooler In Chrome For 2017-Up M8 Touring Models (5469)Jims Forceflow Cylinder Head Cooler In Chrome For 2017-Up M8 Touring Models (5469)

US stock

Usually ships in 3-4 weeks

All orders are shipped out of our UK premises. Estimated shipping date between 16 Jun and 20 Jun.

×

£784.09 inc.VAT
Jims Cylinder Torque Plate Kit For 2017-Up M8 107 Inch & 114 Inch Touring Models (5829)Jims Cylinder Torque Plate Kit For 2017-Up M8 107 Inch & 114 Inch Touring Models (5829)

EU stock

Usually ships in 3-6 business days

All orders are shipped out of our UK premises. Estimated shipping date between 29 May and 3 Jun.

×

£673.78 inc.VAT
Jims Left Main Seal Remover (5830)Jims Left Main Seal Remover (5830)

EU stock

Usually ships in 3-6 business days

All orders are shipped out of our UK premises. Estimated shipping date between 29 May and 3 Jun.

×

£270.12 inc.VAT
Colony Cylinder Stud Set For 1986-2022 XL, 2008-2012 XR1200, S&S 100/107/113 Inch 4 Inch Bore Evo Engines Models (ARM921989)Colony Cylinder Stud Set For 1986-2022 XL, 2008-2012 XR1200, S&S 100/107/113 Inch 4 Inch Bore Evo Engines Models (ARM921989)

EU stock

Usually ships in 3-6 business days

All orders are shipped out of our UK premises. Estimated shipping date between 29 May and 3 Jun.

×

£87.56 inc.VAT
Colony Cylinder Base Nut Kit Hex in Zinc Finish For 1930-1978 B.T. Models (ARM096929)Colony Cylinder Base Nut Kit Hex in Zinc Finish For 1930-1978 B.T. Models (ARM096929)

EU stock

Usually ships in 3-6 business days

All orders are shipped out of our UK premises. Estimated shipping date between 29 May and 3 Jun.

×

£17.65 inc.VAT
Colony Cylinder Base Nut Kit, High Torque in Chrome Finish For 1952-1985 K, XL, 45 Inch Flathead Models (ARM040315)Colony Cylinder Base Nut Kit, High Torque in Chrome Finish For 1952-1985 K, XL, 45 Inch Flathead Models (ARM040315)

EU stock

Usually ships in 3-6 business days

All orders are shipped out of our UK premises. Estimated shipping date between 29 May and 3 Jun.

×

£34.60 inc.VAT
Gardner Westcott Studs Trans To Primary & Cylinder Base (ARM529009)Gardner Westcott Studs Trans To Primary & Cylinder Base (ARM529009)

EU stock

Usually ships in 3-6 business days

All orders are shipped out of our UK premises. Estimated shipping date between 29 May and 3 Jun.

×

£46.07 inc.VAT
Gardner Westcott Head Bolt Cylinder Base Washer in Chrome Finish 3/8 I.D x 9/16 Inch O.D. x 1/8 Inch For 1952-1985 XL Models 5 Pack (ARM545105)Gardner Westcott Head Bolt Cylinder Base Washer in Chrome Finish 3/8 I.D x 9/16 Inch O.D. x 1/8 Inch For 1952-1985 XL Models 5 Pack (ARM545105)

EU stock

Usually ships in 3-6 business days

All orders are shipped out of our UK premises. Estimated shipping date between 29 May and 3 Jun.

×

£22.92 inc.VAT
S&S Head Bolt Kit 88/95/100/106/107/111/117/124 Engines For 1991-2017 B.T. (Excluding 2017 M8) With OEM Heads Models (93-3070)S&S Head Bolt Kit 88/95/100/106/107/111/117/124 Engines For 1991-2017 B.T. (Excluding 2017 M8) With OEM Heads Models (93-3070)

EU stock

Usually ships in 3-6 business days

All orders are shipped out of our UK premises. Estimated shipping date between 29 May and 3 Jun.

×

£134.65 inc.VAT
Colony Cylinder Base Lockwashers 7/16 in Zinc Finish For 1930-1978 OHV & SV B.T., 1957-1986 XL Models (ARM396929)Colony Cylinder Base Lockwashers 7/16 in Zinc Finish For 1930-1978 OHV & SV B.T., 1957-1986 XL Models (ARM396929)

EU stock

Usually ships in 3-6 business days

All orders are shipped out of our UK premises. Estimated shipping date between 29 May and 3 Jun.

×

£5.58 inc.VAT
Gardner Westcott Cylinder Base Nut Kit, Hex in Chrome Finish OEM Style For 1952-1985 K, XL & All 1929-1973 45 Inch SV Models (ARM463305)Gardner Westcott Cylinder Base Nut Kit, Hex in Chrome Finish OEM Style For 1952-1985 K, XL & All 1929-1973 45 Inch SV Models (ARM463305)

EU stock

Usually ships in 3-6 business days

All orders are shipped out of our UK premises. Estimated shipping date between 29 May and 3 Jun.

×

£16.27 inc.VAT
Gardner Westcott Head Bolt Kit 12 Point Excluding Washers For Late 1985-1991 B.T., 1986-1991 XL Models (ARM662505)Gardner Westcott Head Bolt Kit 12 Point Excluding Washers For Late 1985-1991 B.T., 1986-1991 XL Models (ARM662505)

EU stock

Usually ships in 3-6 business days

All orders are shipped out of our UK premises. Estimated shipping date between 29 May and 3 Jun.

×

£120.89 inc.VAT
Gardner Westcott Cylinder Base Stud Set 5x 7/16-14 To 7/16-20 x 2 3/8 Inch For 1978-1984 B.T. Models (ARM221179)Gardner Westcott Cylinder Base Stud Set 5x 7/16-14 To 7/16-20 x 2 3/8 Inch For 1978-1984 B.T. Models (ARM221179)

EU stock

Usually ships in 3-6 business days

All orders are shipped out of our UK premises. Estimated shipping date between 29 May and 3 Jun.

×

£30.71 inc.VAT
Gardner Westcott Cylinder Base Nut Kit, Acorn For 1936-1984 B.T. Models (ARM100729)Gardner Westcott Cylinder Base Nut Kit, Acorn For 1936-1984 B.T. Models (ARM100729)

EU stock

Usually ships in 3-6 business days

All orders are shipped out of our UK premises. Estimated shipping date between 29 May and 3 Jun.

×

£53.41 inc.VAT
Gardner Westcott Cylinder Base Stud Set Includes 5 x 7/16-14 To 7/16-20 x 2 1/2 Stud, 8 Needed For 1930-1977 B.T. Models (ARM504315)Gardner Westcott Cylinder Base Stud Set Includes 5 x 7/16-14 To 7/16-20 x 2 1/2 Stud, 8 Needed For 1930-1977 B.T. Models (ARM504315)

EU stock

Usually ships in 3-6 business days

All orders are shipped out of our UK premises. Estimated shipping date between 29 May and 3 Jun.

×

£27.94 inc.VAT
Colony Cylinder Base Lockwashers 7/16 in Chrome Finish For 1930-1978 OHV & SV B.T., 1957-1986 XL Models (ARM521989)Colony Cylinder Base Lockwashers 7/16 in Chrome Finish For 1930-1978 OHV & SV B.T., 1957-1986 XL Models (ARM521989)

EU stock

Usually ships in 3-6 business days

All orders are shipped out of our UK premises. Estimated shipping date between 29 May and 3 Jun.

×

£7.16 inc.VAT
Colony Cylinder Base Spacers in Black Oxide Models For 1979-1984 1340CC B.T. Models (ARM114315)Colony Cylinder Base Spacers in Black Oxide Models For 1979-1984 1340CC B.T. Models (ARM114315)

EU stock

Usually ships in 3-6 business days

All orders are shipped out of our UK premises. Estimated shipping date between 29 May and 3 Jun.

×

£19.58 inc.VAT
Colony Cylinder Base Stud Set 8 Studs Used in One Engine For 1999-2017 TCA/B Models (ARM031989)Colony Cylinder Base Stud Set 8 Studs Used in One Engine For 1999-2017 TCA/B Models (ARM031989)

EU stock

Usually ships in 3-6 business days

All orders are shipped out of our UK premises. Estimated shipping date between 29 May and 3 Jun.

×

£87.56 inc.VAT
Colony Head Bolt Kit OEM Style Aluminium Heads in Zinc Finish For 1937-1948 74/80 Inch SV B.T. Models (ARM018929)Colony Head Bolt Kit OEM Style Aluminium Heads in Zinc Finish For 1937-1948 74/80 Inch SV B.T. Models (ARM018929)

EU stock

Usually ships in 3-6 business days

All orders are shipped out of our UK premises. Estimated shipping date between 29 May and 3 Jun.

×

£95.05 inc.VAT
Copyright ©2008-2025 ARH Custom Ltd.
 
Loading