Mercury - Quicksilver Installation Gasket Kit OMC Cobra Drive Replacement Marine-Grade Sealing Kit 8M0162541. Overview. When you're working on an older OMC Cobra drive, you come to appreciate the value of precision. Every seal, every gasket and every small component plays a role in keeping the drive running smooth and steady. There's a real satisfaction in bringing one of these systems back to its best - a feeling of knowing you've restored something dependable. The Mercury Marine part number 8M