OER Parts offers a wide selection of Foam Padding & Seat Buns for your 1973 Plymouth Road Runner. OER Parts offers 1973 Plymouth Road Runner Standard Seat Foam, 1973 Plymouth Road Runner Deluxe Seat Foam, 1973 Plymouth Road Runner Seat Burlap Set, 1973 Plymouth Road Runner Universal Seat Foam, 1973 Plymouth Road Runner Bucket Seat Foam, 1973 Plymouth Road Runner Front Split-Bench Seat Foam, and 1973 Plymouth Road Runner Rear Bench Seat Foam.