OK I now have four rally rims and four center caps for my 75 Corvette. They all appear to be OEM pieces, but the center caps are quite loose.
I have tried them on more than one rim so I am fairly sure the rim is not the problem.
Is there any trick to fixing them or do I need to get caps that are new or less worn out? Or is it possible that not all center caps were created equal?
Thanks for the replies. I was having a hard time putting tape on my Corvette parts for some unknown reason. Last night I decided to make some adjustments myself. So I used some pliers to bend out the metal around the lip where the cap is secured to the wheel. This seemed to do the trick. Definitely not recommended for NCRS judging, but for my $6 center caps it worked fine.