Sierra 18-0603 Exhaust Manifold Gasket Set for Mercruiser, Volvo, OMCSierra high-quality engine parts are designed to meet OEM specifications. For Ford 302/351 CID Engines and Indmar Inboard V8 Engines. Use with 18-1998-1 Manifold; Set Includes: (2) 18-2854-1 Exhaust Elbow Gasket; (2) 18-0183-1 Exhaust Manifold Gasket; Interchangeable with: GLM; 39920;