Sierra 18-0398-9 Thermostat Gasket (Priced Per Pkg Of 2)Sierra replacement thermostat gasket for Mercruiser, Volvo Penta, and OMC Stern Drives. Use with aluminum exhaust manifold.Fits: 110/120 & 140/150/160 (I/L 6 cyl.) also MCM 3.0L/LX w/closed coolingInterchangeable with: GLM; 35060; Mallory; 9-60009; Mercruiser Stern Drive; 27-33918; 27-8M2021920; OMC Stern Drive; 312797; 3852111; Volvo Penta; 3852111; 835417;