Sierra International 18-3558 Thermostat - 160 The Sierra 18-3558 Thermostat is interchangeable with the following: GLM 13070, Evinrude/Johnson 982554, 3853799, OMC 9853799, Volvo Penta 3853799. Each Sierra product meets or exceeds the original equipment part it replaces. Sierra Thermostat Meets or exceeds the original equipment quality Sierra part number: 18-3558 Interchangeable with the following: GLM 13070, Evinrude/Johnson 982554, 3853799, OMC 9853799, Volvo Penta 3853799