Maybe they're Corvette seats? No, perhaps they're ultra-rare Phase III seats! Yeah, that's it!
I think we're going to have to classify this car as a real rarity.
Instead of starting with a factory 396 Camaro (clearly too expensive), Motion went with the lo-buck 327 car to save money and the hassle of removing the SS gas cap and fender SS emblems. Then they swapped in a complete driveline front to back (cheaper than just swapping a 396 for a 427), put "Impala" 427 emblems on it and went racing. They must have known that in 37 years there'd be guys analyzing photos of the car as if it were the Zapruder* film. "Frame 134 clearly shows the emblems as having come from a '66 Impala."
(*Abraham Zapruder was the fellow who got JFK's assasination on film.) (JFK was John F. Kennedy.) (He was the president from 1960-63.) (Yes, of the United States.)
Okay, okay, I'm just kidding around--not trying to "flame" anyone. Someone on this forum must be in contact with Mr. Rosen. Perhaps he can be asked about this "mystery" Camaro.
Oh, and Oswald acted alone. (In my opinion.)