SEEKING CAL 500 SLOTTED MAG CENTER CAP SOLUTION

Has the center bore been opened up? Looks a little “off”. Check eBay seller “Lugnut King” from Utah. He’s got a lot of hard to find wheel goodies.
I know what you are saying. I found a post from about 12 years ago where the OP had the same rims, and they were big like this. I don't understand why since 4 inch BPs all had smaller hub diameters. I assume that they are centered by the shouldered lug nuts, but I made some Hubcetrics to get them balls on.