The wheels are from Year One (supposedly compatible with 70 E-Body). It could be that the hub caps are just wore out and the lip is not as big as it use to be. I'll take a closer look tonight and see if they appear to be worn on the outer lip where it snaps into place.

I was considering to paint the rims red but thought that it would be too much RED. Leaving the rims Black with dog dish hub caps and the headers are the only non-factory options on this car.
I can always change them back pretty easy.

Thanks, I'll let you know what it was.