OER Parts offers a wide selection of Foam Padding & Seat Buns for your 1971 GMC K15/K1500 Pickup. OER Parts offers 1971 GMC K15/K1500 Pickup Standard Seat Foam, 1971 GMC K15/K1500 Pickup Deluxe Seat Foam, 1971 GMC K15/K1500 Pickup Seat Burlap Set, 1971 GMC K15/K1500 Pickup Universal Seat Foam, 1971 GMC K15/K1500 Pickup Bucket Seat Foam, 1971 GMC K15/K1500 Pickup Front Split-Bench Seat Foam, and 1971 GMC K15/K1500 Pickup Rear Bench Seat Foam.