Get the P crest advertised on ebay as "PORSCHE STEERING WHEEL BADGE" (1.5").
PORSCHE STEERING WHEEL BADGE EMBLEM LOGO | eBay
The shape of the badge is about the same as your wheel center caps. If not, you can shape them in your hands (semi-flex material). You will need a dremel to shave off the little pin on the back of the badge. Finally, use epoxy to secure them to the caps and voila, your wheels are perfect
Nice work!!!