I have 6 NOS standard Boss and others hubcaps still in the boxes. The ones that are the plain dog dish style that have Ford Motor Company stamped and painted on the front face.
I would trade all 6 to for a set of 4 NOS 68-69 GT caps for the styled steel wheels.
I also have what I believe to be 4 used trim rings for the same 15X7 wheels. I am double checking on this. 2 are pretty nice and 2 are decent. They should be able to be cleaned up pretty nice with a little polishing. I would include them with the caps if someone wants them.