Sierra 18-0680 Exhaust Manifold Gasket Sierra Exhaust Manifold Gasket Meets or exceeds the original equipment quality Sierra part number: 18-0680 Interchangeable with the following: GLM 33580, Malloy 9-61428, Mercruiser 27-815528, OMC 3853256, 914578, Volvo Penta 3853256 Fit specific, check part numbers to ensure proper fit