Sierra International 18-0182-9 Thermostat Gasket - Pack of 2 Sierra Thermostat Gasket Meets or exceeds the original equipment quality Sierra part number: 18-0182-9 Interchangeable with the following: GLM 30610, Evinrude/Johnson 310058, Mallory 9-60002, Mercury 27-62386, 27-62386001