John,
Thank you for answering my query. The guy I got these parts from years ago said they came out of a Chevelle he owned, but did not specify the year. I do know the rubber carpet ring is *not* correct for '64 full size because I've seen those and they are more of a "0" shape rather than this "O" shape.
I will pm you regarding my plans for these parts.
Thanks again
Verne