I'm looking to get different wheels on my 1985 d100 but I'm having issues with the wheel center bore, or the hub's pilot diameter if you want to look at it that way. bolt pattern is 5x5.5(139mm)

I measured the hub with calipers and it is 3.535" (89.79mm) exactly. I can't find a thing on the web about this being the size for my dodge, much less any wheels that fit.

The centers for new wheels with my bolt pattern are roughly 3.25" or 4.25". Whats going on here?