It is set up for a 1" stem

These Drag Specialties radius license plate mounts offer a unique custom look and fit 3 bolt Harley-Davidson fenders up to 8" wide

45/64 LONG Chrome plated hex washer head screws 1948-1964 Harley-Davidson Panhead with steel 'D' rings

The design of these 3-piece

low friction loss SAE 85w viscosity eliminates clutch drag and slipping

#9815-16 Lifter Base Screw Kit Special 1/4-20 Aftermarket Harley-Davidson Cases - CAD Plated Brand_ODI It is set up forCad plated 1 4 20 slotted screws for fastening early style countersunk lifter bases on after market motor cases with 1 4 20 tapped holes. Made in Ohio, USA.