I used these and they fit fine. Painted with rattle-can white.
https://www.ebay.com/itm/AIRCRAFT-WHEEL-COVER-AIRPLANE-HUBCAPS-CLEVELAND-6-00X6-PIPER-CESSNA-172-152/292598827167?hash=item44203fc89f%3Ag%3APl8AAOxyzGlQ7jb4&_sacat=0&_nkw=cessna+hub+caps&_from=R40&rt=nc&_trksid=p2060353.m570.l1313.TR0.TRC0.A0.H0.Xcessna+hub+caps.TRS4