1964-77 Oldsmobile, Buick Rally Wheel Lug Nut Kit 20pc These are the correct 3/4 hex size with the correct taper at the wheel. Made from steel, with factory chrome finish. This is 7/16-20 thread for all A-body, x-body NOT for the B-body Fullsize they use 1/2" This is the best nut on the market. This is an exact inline tube reproduction. It is the correct size and shape.