I just had some MT Classic II wheels, 8 x 16 put on and they have a thick center section, which leaves very few threads on the stud to hold the wheel on. I did a search and found a Dorman part# for the fronts, but not on the rear. Looking at the catalog at NAPA, I came up with two possibilities in
1/2 x 20, both are .560 knurl.
Dorman 610-192, 2 1/32" long, shoulder 11/16"
Dorman 610-176 2" long, shoulder 23/32

I am wondering if anyone has used either one and which
one worked the best.

85 SR5 4X4 XTRA, 22RE
W56, Marlin Crawler 4.7
4" lift, 4.88