or you are using a non-stock wheel this may affect the rear sprocket alignment

A USA-made alternative are those made here in Ohio by Led Sled Customs

They are coped at 1 inch to fit standard size frame tubing

This complete inner primary mounting kit contains reproductions of original Harley Davidson hardware used to mount a stamped steel inner primary cover to the crank case and frame on Panheads 1955-1964

no modifications needed

#3431-24 Front Rocker Plate Stud Kit 1916-1929 Harley-Davidson - Nickel Plated Nut Type_Lock Nut or you are using a#3431 24 Front Rocker Plate Stud Kit 1916 29 Harley Davidson. OEM# 2639 12, 2640 16. Made in Ohio, USA.