I have wheel adapters that came with my brothers dakota, he bought it and the guy had a set of aftermarket wheels and wheel adapters 6x4.5 to 6x135, he didn't get any lug nuts though. I took an adapter into pep boys and tried every option of lug nuts that they have, 1/2" too small, 14mm fits but they only had 14mm 1.5 & 2.0 thread?? The 1.5 only went on a tiny bit and the 2.0 went on all the way but it had some slop in it, it wasn't rite. Does anyone know anything about this or does anyone know of there are 14mm 1.75 thread lug nuts? I can't seem to find anything on the Internet and I wanna order some red lugs

 

If 14x2.0 fit, then that's what the thread is. If it was loose, either the lug nuts or the studs have been modified or were poorly manufactured.

edit- 14x2.0 is equivelent to 9/16-13