though if you are running a vented gas cap this vent tube is not needed

Chrome plated duplicate of Fork Tube Cap/Plug

214 inch diameter hole to properly fit the stock 1200 Sportster rear wheel

This pair of Black Anodized Aluminum 39mm Low Profile Fork Caps are machined from 6061T6 aluminum to fit a standard Harley 39mm front end

BSA singles like the B25

#2743-2 Oversized Ignition Timer Cover Stud Kit 1980-Up Harley-Davidson Big Twin/Sportster - Zinc Plated Bar Control Diameter_7/8 inch though if you are runningZinc plated ignition timer cover studs used on 1980 up Big Twins and Sportster. 2 kit. Made in Ohio, USA. NOTE: The threaded portion is 10 32 the original threaded holes are 8 32