TristanZ28

Hello all, I have a '77 Z28 and I need a trim ring for it. I've had a difficult time finding one because it's not the normal 3" ring that fits on the inside/outside of the rim. The one I need attaches on the outside and is approximately 1.5" wide. I've found one in Z28 catalogs, but they are $70+. I have also checked local junk yards but no luck. Any thoughts???

Tristan