OER Parts offers a wide selection of Foam Padding & Seat Buns for your 1970 Plymouth Duster. OER Parts offers 1970 Plymouth Duster Standard Seat Foam, 1970 Plymouth Duster Deluxe Seat Foam, 1970 Plymouth Duster Seat Burlap Set, 1970 Plymouth Duster Universal Seat Foam, 1970 Plymouth Duster Bucket Seat Foam, 1970 Plymouth Duster Front Split-Bench Seat Foam, and 1970 Plymouth Duster Rear Bench Seat Foam.