Here is what mine look like, I got the full set for $200! and they have center caps and are actually pretty damn clean! You just got me more stoked on them! I could find too much info, I don't think mine are as rare as yours but hey, I paid $200!
I haven't personally checked. I did a bunch of research on the subject the other night and didn't notice any mention of a change in thickness between the two, although that wasn't really the information I was after.Was there a thickness change as well? Have you checked?