Brake drum identification

[ho70]

I am still problem solving my rear brakes. I had drums and they did not fit. Got a second set (same part number) and one was the same as the ones I took off (old ones) and it fit great. It is the drum on the right. It is the same width, but a quarter inch taller. Supplier is looking for another one. Is this drum off a truck with the extra leaf spring or a 12" rear end? The part numbers are the same, but depth is different. I have a 72 12" rear with coils and the extra leaf spring. It is a half ton LWB. thanks. Service manual was no help.

[Ironangel]

I don't have a definitive answer except that perhaps the wrong drums were on the truck to begin with? I do know the 72's had wider/longer rear axle's than the previous years. Somebody was on the engine & drive train section a couple of weeks ago with a similar problem showing up in what appeared to be the axle lengths.