Sierra 18-2909-9 Exhaust Manifold Gasket (Priced Per Pkg of 2)This exhaust manifold gasket set is an aftermarket product that meets or exceeds OEM requirements. Supersedes 18-2909; Use with: Exhaust Manifold 18-1952-1; Exhaust Manifold 18-1932; Interchangeable: Crusader; 9749; GLM; 32170; Mallory; 9-61421; MerCruiser Stern Drive; 27-99757; 8M0215011; OMC Stern Drive; 3853412; 910157; 915025; Volvo Penta; 3853412; 856116; Yamaha Sterndrive; YSC-12190-00-AC;