Mine seem to be 9/16" but corroded down a bit in size. Maybe some metric socket will fit it perfectly. Not that they were metric in '54, of course.

Last edited by Wally / Montana; 05/29/2021 11:08 PM.

1948 3/4-Ton 5-Window Flatbed Chevrolet

34 Years. Now with a '61 261, 848 head, Rochester Monojet carb, SM420 4-speed, 4.10 rear, dual reservoir MC, Bendix up front, 235/85R16 tires, 12-volt w/alternator, electric wipers and a modern radio in the glove box.