The weld-on mount is coped for 1" diameter tubing

7947W castle nut

Oversized outside diameter +

This gas tank with key switch is a reproduction of the gas tank used on Harley-Davidson Model 125 and Model 165 motorcycles from 1948 to 1959

530 Series O-Ring Replacement Rivet Style Master Link - Chrome Fork Tube Diameter_41MM The weld-on mount is copedThis is a replacement 530 Series O Ring replacement rivet style master link for Drag Specialties brand chains. These replacement master links are available in a standard raw chain finish as well as chrome to match chrome plated Drag Specialties brand chains. It never hurts to have a spare master link in your tool bag! Note: This O Ring chain requires a rivet tool to install the master link.