Yenko 1964 Corvette back seat -- dealer option

[Tom Piper]

In the summer of 1968, I purchased a used 1964 Corvette coupe from a dealer in Western PA. When I bought it, it had a back seat in it. The dealer told me that it was installed by Yenko Chevrolet near Pittsburgh, Pa.
Since I was in my late teens, I didn't have much use for a back seat for children, and I almost took it out. But, my friends convinced me it looked nice, so I left it in until I did a body-off restoration in 1982. Since then, except to put it in for a Corvette club meet, the seat has been in storage.
You can see the seat by scrolling half way down this page:
https://www.yenko.net/oldads/oldads.htm

I have posted this message on several Corvette message boards over the years to find out more about the seat and if anyone else has one. I've not found any others at this time.
I do know there were others because I saw one other one myself at a car show in Pittsburgh about 1970. It was exactly like mine except for the color. In addition, a long-time member of the Corvette club in Western Pa, said there were several in the club about the time of the '63 -'67 car.

Does anyone else have any other information on this seat or know anyone else who has one?

Thanks

Tom Piper