It's the 1/2 ton 4x4/light 3/4 ton center that is held on with the plastic nut caps. One issue with them is that they require special lig nuts that have threads on the outside. I got lucky and found them at the same swapmeet that I found the caps at. The nuts are 1/2-20 thread with a 7/8" hex. It did requre slight modification to the wheel to make them work. Namely, increasing the size of the lug nut seat with a 60 degree countersink to match the nut size. If I were to do it over, the caps have 3 bosses on the backside that could be drilled and tapped for a screw, and held on from the backside through the holes for the OE style caps. Nice thin about these caps is that they come with the Bowtie on them, instead of the 4x4 logo, and also are a set of 4 closed caps, instead of 2 closed and 2 open. The caps are pretty easy to find, many venders have them at the swaps, LMC should have them, too. I think Napa might have the lug nuts I used.
