Sierra 18-3872 Head Gasket Sierra Head Gasket Meets or exceeds the original equipment quality Sierra part number: 18-3872 Interchangeable with the following: GLM 35900, Mallory 9-63852, Mercury 27-41245-1, 27-41244T02, 27-41245, 27-41244, 27-77671, 27-96541, 27-90279, 27-412452