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Sierra piston rings for Mercury Marine/GM/OMC engine. Sierra Part #18-3937.Manufacturer/OEM Part Number: Mercury Marine: 39-17464GM: 14089025OMC: 328506OMC: 914555OMC: 985083OMC: 986336OMC: 3853268OMC: 3853960 For Mercury Marine/GM/OMC engine Sierra Piston Rings For Mercury Marine/GM/OMC Engine, Part #18-3937 Camping World Sierra Piston Rings For Mercury Marine/GM/OMC Engine, Part #18-3937