Kevinski - According to info I have read in Parts Books, GM Heritage site documents and other info from sources like Jim Carter, the 1/2 ton front Huck brake drums are different from the later Bendix drums in a couple of ways. These particular drums were designed for use with 1-3/4" wide brake shoes and had 3-3/4" diameter hub hole vs the Bendix drums which were designed/used with 2" wide brake shoes and had a 3-1/2" diameter hub hole.
I recently replaced all my Bendix brake shoes and drums (along with wheel and master cylinder and associated parts) with readily available new parts for not a ton of cash. Very happy with them after completing the system rebuild on my '51 3100.
