Sierra 18-1998-1 Exhaust Manifold - Port & Starboard for Ford V8 EnginesFits Port and Starboard Sides. Universal Center Riser Manifold.Fits: Crusader 302 and 351 CID Engines; Interceptor 221, 260 and 289 CID Engines; Commander, Mercury, OMC, Palmer, Pleasurecraft & Waukesha; Comes with 18-4363 Mounting Package; Use 18-0603 Exhaust Manifold Gasket Set; Includes: Exhaust Elbow Gasket: 18-2854-1; Exhaust Manifold Gasket: 18-0183-1; Pipe Plug: 18-4258; Use With: Exhaust Manifold Gasket: 18-0183; Exhaust Manifold Gasket Set: 18-0603; Exhaust Manifold Mounting Kit: 18-8538; Riser: 18-1907 and 18-1939; Elbow: 18-1999; Manifold Spacer: 18-1949; Exhaust Elbow Mounting Package: 18-4363; Fuel Elbow: 18-8112 ; Interchangeable With: Barr; FM-1-83; FM183; GLM; 56250; Mallory; 9-40111; Osco; FL994; FLCR818; HGE 1-81; ;