OER Parts offers a wide selection of Dress Up Kits for your 1978 Plymouth Horizon. OER Parts offers 1978 Plymouth Horizon Valve Covers, 1978 Plymouth Horizon Exhaust Manifolds, 1978 Plymouth Horizon Intake Manifolds, 1978 Plymouth Horizon Timing Covers, 1978 Plymouth Horizon Water Pumps, 1978 Plymouth Horizon Oil Pans, 1978 Plymouth Horizon Custom Under Hood Mirrors, 1978 Plymouth Horizon Radiator Support Show Panel, and more...