Sierra 18-2405 Mercruiser Gear Repair Kit for MR and Alpha 1 DrivesSierra high-quality engine parts are designed to meet OEM specifications. Kit Includes: (1) 18-1117 Pinion Bearing; (1) 18-1143 Tapered Roller Bearing; (1) 18-1155 Ball Bearing; (1) 18-1158 Carrier Bearing; (1) 18-2202 Sliding Clutch; (1) 18-2206 Gear Set; (1) 18-2285 Shim Set; (1) 18-2294 Shim Kit; (1) 18-2298 Tab Washer; (1) 18-2299 Tab Washer; (1) 18-2343 Pinion Nut Washer; (1) 18-2652 Lower Unit Seal Kit; (1) 18-3719 Pinion Nut; Interchangeable with: GLM; 25125; Mallory; 9-79200; Mercruiser Stern Drive; 43-803091T1; Application:Mercruiser Stern Drive R/MR/Alpha One (Sterndrive); 1983-1991; s/n 6225577 thru 0D469858; R/MR/Alpha One (Transom Assembly); 1984-1991; s/n 6216687 thru 0D469858;