While going through my collection of 67 (and possibly 68) SS trim rings, I found one NOS and a few other used ones that still had visible ink stampings, as shown in the attached pictures. Part # C7OA-1210-A
Looking at the 67 MPC, the 1007 wheel assembly C7ZZ-1007-B styled steel wheel uses the C7ZZ-1210-A trim ring. The trim ring entry lists a size of 15-3/8" OD x 11-15/16" ID. No reference to C7OA-1210-A.
The 65-72 conglomerated MPC concurs with the 67, and adds a C8ZZ-1210-B as 15-3/8" OD x 12" ID (1/16" larger than 67) x 2" wide (the 67 width was not identified). In the description contains a reference to C8OA-1210-B.
Also going from the way back memory cells I seem to recall that the 67 ring was fully polished, while 68 had a lightly brushed finish. Can anyone confirm, correct, or clarify that memory? If brushed, was it brushed along the edge parallel with the tire as well as the 2" wide surface?
My interim conclusion is that:
1. C7ZZ-1210-A = C7OA-1210-A = polished
2. C7ZZ-1210-B = C8OA-1210-B = brushed