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
0-and-2 to Jay Bruce. Two out in the 9th, 10 to 2 New York. Familia sets... holds the set... now the 0-2 pitch. Swung on and missed, strike three, put it in the books! The New York Mets have won the 2015 National League Eastern Division championship, and the Mets pile out of the dugout and come out of the bullpen and begin the celebration.
- Howie Rose calls the Mets clinching the 2015 NL East title, WOR Radio, September 26, 2015