Mounting Specifications: Designed to fit in a standard 3/4-inch round mounting hole

Chrome plated reproduction fasteners to mount gas tank on Big Twins 1937-1975 and FX 1971-1972

derby inspection covers on Harley-Davidson Big Twins 1936-64

Rocker Shaft End Plug Cap Kit CAD Plated

It accepts any cam-style Harley-Davidson gas cap and accepts a 1/4" NPT petcock

#2921-2 Spring Retainer & Acorn Nut Set 1936-1948 Harley-Davidson Big Twin Springers 1936-1952 45s 1953-1954 Servi-car - Chrome Plated Length_5" Mounting Specifications: Designed to fitChrome plated retainers and acorn nuts are reproductions of original parts used on 1936 52 '45s,1953 54 Servicar, and 1936 1948 Big Twin Springers. Made in Ohio, USA.