For what it's worth,
I made mine from 6063 billet, and they have clearance on the front hubs, that I guess another vendor had an issue on. They are the same dimensions as the OEM.
The big drawback with OEM is they were stamped steel and very thin gauge. As they were dissimilar metals you would get galvanic corrosion and had one heck of a time getting them off.
So mine are not identical to OEM, but they are much easier to pop in and remove without damaging.
$85 for a set of 4
http://shop.914rubber.com/914-wheel-center...m?categoryId=-1You will also notice they are not chrome plated like the OEM, but have a clear anodized finish to keep them from oxidizing.
It's the same finish as the rims