OER Parts offers a wide selection of Body Panels for your 1988 GMC S15. OER Parts offers 1988 GMC S15 Truck Bed Components, 1988 GMC S15 Stepside Bed Sides - Full, 1988 GMC S15 Bed Sides - Partial, 1988 GMC S15 Running Boards, 1988 GMC S15 Side Steps, 1988 GMC S15 Patch Panels, 1988 GMC S15 Front Bed Panel, 1988 GMC S15 Stake Pocket Repair Panel, 1988 GMC S15 Bed Floor Panel, 1988 GMC S15 Stepside Rear Fender, 1988 GMC S15 Fiberglass Bed Side, and 1988 GMC S15 Rear Bed Corner.