OK, here is a pic of each wheel. The first pic, with the round center, does not fit the truck. The second one, with the not-so-round center fits the truck. The first one is just a tad over 1/16" smaller than the second. The powdercoating is nowhere near that thick...so I need to get 3 rims machined.
Notice the lug and center cap seating surfaces on the second rim, whereas the first is completely flat?
The offset/backspace and rim width is identical on all 4.
Well, now we all know something new about these trucks...I just found out the hard way.