60-66 K20 rear drum brake info needed

[Short 3/4]

So now I (think) I’ve verified that the hubs are different but the drums remain the same between different years. The question is: what trucks used the hubs I’m looking for…and of course, where to find them. And even though GMC never used an Eaton rear, I’ve heard that the D60 stubs are basically the same, so maybe some brake parts (like the hubs) might interchange?

I’m now using the 66 and up style press on drums, but really want to convert back to the early slip on type.

Any tips, leads or pictures would be greatly appreciated,
Thanks
Tom