I had my wheels machined out to clear my hubs. Since they started at 73.1mm and then necked down to 2.5", I just had them machined straight through at 73mm.
I found I could run this cap on my rims. It sticks out a little bit, but it covers everything.
Ultra Wheel Center Caps 89-8059S
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Initially I just painted them silver to match the rims. Then I managed to find a generic wheel cap that fit my RPF1's, so I used it in the rear and then cut the front cap down and JB welded the wheel cap onto the cover...
Rears with generic cap
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Fronts with cut down metal cap painted to match the rim,and the generic cap JB welded to it
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You could also just use the push through wheel caps by themselves and paint them to match your wheels. I'm sure you could find a smaller diameter cap for the rears to look similar.
