Just in case anyone is interested in the result of the investigation, I found out that this carpet ring is correct for '64-'66 Chevelle. In fact, this one is nos, because the assembly plant stapled it to the carpet and this one has no staple holes. It took awhile, but I just thought I'd share the findings so others would know.
It's going to my buddy who's building a '64 ElCamino bench seat 4-spd.
Verne
