Carrier Oil Seal Assembly Meets or exceeds the original equipment quality part number: 18-0577 Interchangeable with the following: GLM 28370, Mallory 9-78100, Mercruiser 66081A2, 35993A1, 66081A1, 66081A4 Fit specific, check part numbers to ensure proper fit The 18-0577 Carrier Oil Seal Assembly is interchangeable with the following: GLM 28370, Mallory 9-78100, Mercruiser 66081A2, 35993A1, 66081A1, 66081A4. Each product meets or exceeds the original equipment part it replaces.