I have a set of the late style ('75-'78) Chrysler Road Wheel Center Caps, but I need a set of the early ones.
As those are unobtainium, I settled for a set of repop AMC Volcano Center Caps. I paid $138 for a set:
The quality of the repops gave me a pleasant surprise: they are quite nice!
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The base seems to be very similar to the Chrysler Center Cap:
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Although the base is slightly thinner on the AMC cap:
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Which...
AMC Volcano Center Cap vs Chrysler Road Wheel Center Cap