chrome center caps

[65truckowner]

I am at a loss here. I have a restored 65 chevy truck with the later model running gear under it (1983). Anyway I bought a set off allumiumn rims for it and cant find chrome center caps for this rim. It is an allumiumn modular rim with the holes around it. The center opening is 3 and 5/8 inches Does anybody have a clue where I might find the center caps this size. I have tried lmc,ebay and some other sights online.