OER Parts offers a wide selection of Body Panels for your 1989 GMC S15. OER Parts offers 1989 GMC S15 Truck Bed Components, 1989 GMC S15 Stepside Bed Sides - Full, 1989 GMC S15 Bed Sides - Partial, 1989 GMC S15 Running Boards, 1989 GMC S15 Side Steps, 1989 GMC S15 Patch Panels, 1989 GMC S15 Front Bed Panel, 1989 GMC S15 Stake Pocket Repair Panel, 1989 GMC S15 Bed Floor Panel, 1989 GMC S15 Stepside Rear Fender, 1989 GMC S15 Fiberglass Bed Side, and 1989 GMC S15 Rear Bed Corner.