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
Gerardo Parra, a lefthand batter, steps in to lead off. Harvey's first pitch on the way, it's a fastball on the inside corner for a called strike, nothing and one, a 93-mile per hour fastball to Gerardo Parra. Parra batting at .281 with 6 homers, 28 runs batted in. - Howie Rose's call of Matt Harvey's very first pitch in the big leagues... Mets at Arizona, July 26, 2012