Don't know if this is helpful SusieQ, perhaps you already know of this source. Found it stumbling around the internet looking for hubcaps. They seem to have a pretty good selection of vintage styles in many sizes.
Thanks, gfgirl. I think they have a round moon in a diameter that will fit but I'm not sure if it will be deep enough. The price is right! Wish someone else would try them first, ha
Susie, HubcapMike is located just a few miles from me. I "stopped by" when I was looking for some 8" diameter caps for my Mallard's six lug wheels.
I finally found some 49 to 51 Chevy very nice heavy thickness stainless "no name" reproduction caps at a classic Chevrolet parts company, but they cost $50 bucks each. I rationalized the high cost, by knowing you can't get the originals chrome plated for that price.
The new baby moon caps that HubcapMike "had in stock" were the "cheap, imported, very thin, poor chrome" hub caps sold currently by many different wheel companies.