Well 66 was the last year for the Knock off on the vette, whose design is nearly identical to that of Porsche, and the current race offerings from Pratt and Miller. In fact all pin drive center locks have nearly the same designed.
I will have to say I cant find it, I guess it was not necessarily the hub/affixing design that was the NHTSA/ DOT's problem it was the "spinners" that were used as the center hub nut.
And really to be honest I had always wondered how or what loop hole Porsche was getting the GT into the US with a center lock wheel.
Now I know learn something every day ;)
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