Sierra 18-2613 OMC Cobra Sterndrive Outdrive Gasket SetFor Use On All OMC "Clutch Dog" Cobra Sterndrives 1986 - 1993. Not For Use On King Cobra Sterndrives. Sierra replacement parts are manufactured to meet or exceed OEM requirements.Kit Includes: (1) 18-2918 Outdrive Gasket; (1) 18-2996 Outdrive Seal; (2) 18-7153 O-Ring; Interchangeable with: GLM; 39630; Mallory; 9-62605; OMC Stern Drive; 0508105;