The 'D' shaped hole is a perfect fit for the Lowbrow Customs Weatherproof Starter Ignition Switch (the last ignition switch you should ever need to buy for your bike

KPMI wrist pin bushings are held to tight dimensional tolerances

This tab accepts the ever-popular Lowbrow Customs Weatherproof Starter Ignition Switch or any other ignition switch with a 13/16" body

To mount these Shotgun Pipes to a rigid frame we recommend the Rigid Frame Mounting Bracket for Shotgun Exhaust Pipes (Sold Separately)

Axle nut and washer spacer OEM# 43617-95 add a clean

#2671-2 Instrument Panel Light Shield Kit 1939-1946 Harley-Davidson Big Twins/45s - CAD Plated Makes_BSA The 'D' shaped hole isCAD plated reproduction of OEM# 4523 39 and 4523 39A used on 1939 1946 Big Twins and 45s. Made in Ohio, USA.