They can't be original seats... they didn't have plastic seats back then. Maybe when they installed these seats they decided to have them be red seats for the reason you state, but these are not original 1950s vintage seats.
Originally Posted by Shotgun Shuba
Archie Bunker: All I can tell you, Edith, is I'm surprised at you! Dragging me off to a moving picture like that! It was absolutely disgusting!
Edith Bunker: Well, I'm sorry, Archie, how was I to know? I thought it was a religious picture, "Cardinal Knowledge!"