Small hub wheels on drum brakes

[clemsonteg]

I hope this is in the right spot. I didn't see a wheel specific forum.

I recently acquired a set of torq thrust st 6 lug wheels for my 70 C10. I pulled one of my rallies off to do a test fit of the wheel and noticed that the hub on the drum is around 4" while the hub on the wheel is around 3". This seems like a bit of an issue and I was curious as to how I might go about resolving it. I'm sure it is related to a new aftermarket wheel vs. old brake design, so I am hoping this is a somewhat common issue with a fairly easy resolution.