I have compared the 1936 1/2 ton and 1 1/2 ton fenders side by side, off the trucks, and I don't see any difference.
1936 Chevy 1/2 tons had the spare on the passenger side fender, GMC 1/2 tons had the spare on the drivers side. The larger trucks, Chevy and GMC, did not have fender mounted spares.