It includes a new copper 9-bolt head gasket in addition to all the o-rings

they DO NOT fit Wassell reproduction concentric carburetors

and help keep vibration down

Use only copper-cored HT leads - no carbon-fiber or resistive wires

Cylinder head modification is also not needed

Bayonet / Cam Harley Style Vented 2" Gas Cap - Black Vendor_Colony Machine - Stock Parts It includes a new copperBlack Vented 2" diameter Fits all year ranges of single cap gas tanks that accept a bayonet cam style gas cap, all 1936 64 H D Big Twin gas tanks (both left and right side), and right side gas tanks on H D 1965 1972 Big Twins. Replaces Harley # 61103 36 These bayonet style gas caps (also known as cam gas caps) are vented and are black steel. An inexpensive cap that does the job and works with all stock and aftermarket gas tanks with a single bayonet