1/2 inch diameter bolts are used on 1972 and earlier DRUM brake cars. A body.
9/16 inch diameter bolts are used on 1965-72 DISC brake cars. A body.
5/8 inch diameter bolts are used on 73-76 disc, drum, brake cars. A body.
FYI
I keep these in stock.
[FOR SALE] - Bolts, Lower Ball Joint To Spindle. A,B,E, Body. Disc & Drum Brakes.