Roadmaster Center Cap Decals for Impala SS wheels

Joseph, the graphics guy, sent me a set of center cap decals. Nice gloss, bright colors, Look great!

Please order a set from him! Want this to be worth his time! $20 sign4sale@aol.com

-Mike

Those decals (or similar) are exactly what I want to put on some plain center caps - but the center caps are so far hiding from me.
The 2 places which specialize in hub caps, wheel covers, and center caps that I know of do not seem to have any such thing, or don't know they do. But they apparently use the Holland interchange list, which is no help on this.
I have one source (another Forum) who says some Chevy Van center caps will work, but I have been unable to confirm that or find any to try for a fit.

Cheers
Warren