I wasn't saying I was right, just suggesting that the hubs and drums might have been off a 51-54 chevy car. They will fit on a 1/2 ton truck spindle. But they are 5 on 4-3/4. I gave you all the information I have. You kept saying they were 5 on 5 pattern, but never said you'd measured the bolt circle, and your post today was the first time you mentioned they came off a Chevy Silverado, but without a year of that truck, there's no way to confirm what the bolt pattern might be (later Silverados ~2000+ could have a metric pattern.)
Sorry that you feel bad about this. If I knew what your brake drums were, I would certainly tell you.
The more information you give us, the easier it is to help you. For instance Brake drum ID and width would help.
Maybe what you'll need to do is take the hub and drum to your parts store and compare with what they have. Possibly a '70 or '71 Chevy truck would fit. 1971 C10's had 5 on 5 wheels, but had disk front brakes. 1965-1969 C10's had 11" x 2" front brakes but 6 on 5.5 wheels.
