Sierra 18-2819-1-9 Exhaust Elbow Gasket (Priced Per Pkg Of 2)Sierra replacement exhaust elbow gasket fits MCM 120 engines.Fits: 120 GM 153 I/L4; 1964-1982; 160 GM 250 I/L6; 1967-1969; Use with: 18-1973 Elbow; 18-1975-1 Riser with Exhaust Tube; Interchangeable with: Barr; MC472739915; GLM; 31410; Mallory; 9-61423; Mercruiser Stern Drive; 27-39915; Osco; 5538-G;