Sierra 18-2743 Outdrive Mounting Gasket The Sierra 18-2743 Outdrive Mounting Gasket is interchangeable with the following: GLM 31141, Mallory 9-61012, Mercruiser 27-94996A20, 27-94996, 27-94996A1, 27-64818A2, 27-949962, 27-64818A3, 27-94996A2, 27-94996Q2. Each Sierra product meets or exceeds the original equipment part it replaces. Sierra Outdrive Mounting Gasket Meets or exceeds the original equipment quality Sierra part number: 18-2743 Interchangeable with the following: GLM 31141, Mallory 9-61012, Mercruiser 27-94996A20, 27-94996, 27-94996A1, 27-64818A2, 27-949962, 27-64818A3, 27-94996A2, 27-94996Q2