how the drum is sitting relative to the backing plate will tell you what is wrong.
If the drum is standing off the backing plate and maybe a bit ****-eyed might indicate the keyway is not in the hub properly, or the seals not setting in place ncorrectly, or something else not letting the hub go fully home. If the drum is pulled hard against the backing plate so it will not turn, and is square to it, would indicate the axles are the wrong ones and are too short.
It's nothing to do with the hubs or backing plates, they will fit all years.
If it would help I could get a dimension from the axle housing to the end of the taper, at the base of the thread. That should be pretty similar in all applications. Let me know if you want me to do that.
Mart.