Sierra 18-2663 OMC Lower Unit Seal Kit - Replaces 0981797Sierra high-quality engine parts are designed to meet OEM specifications. For use on 1977 OMC Stern Drive engines.Kit Contains: (4) 18-2012 Oil Seal; (1) 18-2020 Oil Seal; (2) 18-2058 Oil Seal; (1) 18-2851 Swivel Bearing Gasket; (2) 18-4248 Drain/Fill Plug Washer; (4) 18-7120 O-Ring; (1) 18-7129 O-Ring; (1) 18-7135 O-Ring; (1) 18-7167 O-Ring; Interchangeable with: GLM; 87620; OMC Stern Drive; 981797;