Sierra International 18-1237 Oil Pan Gasket Sierra Oil Pan Gasket Meets or exceeds the original equipment quality Sierra part number: 18-1237 Interchangeable with the following: GLM 39850, Mallory 9-61504, Mercruiser 27-138651, 27-13865, FI1101281, OMC 3856138, Volvo Penta 3856138