I'd look for the complete hubs, drums and backing plates from a Bendix brake equiped truck. Should be any single-wheel 1-ton up through '59. Check the bearing part numbers to confirm that, but I'm confident its the case.

1955 1st GMC Suburban | 1954 GMC 250 trailer puller project | 1954 GMC 250 Hydra-Matic | 1954 Chevy 3100 . 1947 Chevy COE | and more...
It's true. I really don't do anything but browse the Internet looking for trouble...