[G_T]

Thanks Frank - I took more measurements and photos tonight so I was *absolutely* sure what was going on.

First the good:

I mentioned that the forgeline center caps were being pushed off the front wheels by the Wilwood dust caps. You graciously offered to machine them. I took them off just now and found a 1/8" tall casting tab on the back of the Forgeline center caps. I trimmed them off with a razor and it all fits perfect. What is nice about this, is that appears I have no fitment issues on the front of the car (final verdict when I install the fenders.) See the first 3 pictures. Hope this comes in handy for others...

Second, the bad:

It is definately the axle studs. Hard to see in the pics, but hopefully you will see the change in width at the base of the axle studs (it's about 1/16" wider than the threads). As suggested, opening the rotor hat holes by 1/16" would allow the hat to sit flush on the axle. However, in measuring it, the shoulder on the studs is taller than the face of the hat (shoulders are approximately 1/8" high and the hat thickness is less). This means that the studs won't fit into the Forgeline wheels completely - so the wheel will not seat properly. I tried just putting the wheel on without the hat and sure enough, it won't seat down the last 1/8". I think the only option is to replace the wheel studs on the axles with ones that are machined all the way down... maybe switch to the threaded in studs vs. press in? I don't think I can use a tap/die to chase threads all the way down - that is probably a bad idea anyway. Suggestions?