I bought a spare set of wheel centers from PI Motorsports for my clones purchased from them. I would imagine that the center opening is a standard size, I'm thinking about 2". They are made of chrome plated plastic and I glued the new logos (black) into them although they snapped in very tight and probably didn't need any glue. There is an o-ring on the center cap that keeps them in place on the wheel. I used a little silicone spray to remove and reinstall them. I had considered machining a set out of aluminum but it was too easy to buy a set.
Steve
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