Sierra Marine 18-21001 Mercruiser Gimbal Bearing Non-greasable Mercruiser gimbal bearing from Sierra Marine. Sierra engine parts are designed to meet or exceed OEM requirements. Fits MC-1, R, MR, and Aplha 1974-97, Gen II Aplha 1991-97, Bravo IIIIII 1988-95 Replaces Mercruiser Stern Drive 30-879194A02 30-60794A4 30-60794B4 30-60794A2 Includes 1 Permalube gimbal bearing 1 Grease passage plug Installation Instructions for Sierra Gimbal Bearings When changing the gimbal bearing to the permanently l