Sierra International 18-2917-9 Marine Thermostat Gasket - Pack of 2 Sierra Thermostat Gasket Meets or exceeds the original equipment quality Sierra part number: 18-2917-9 Interchangeable with the following: GLM 315560, GM 3701777, Evinrude/Johnson 3701777, Mallory 9-60007, 9-60007-10, Mercruiser 27-53045B1, FI5000096, FI1101276, F10077105, FI1101291, 27-33179, 27-53045, 27-530451, OMC 3701777, 312797