Gimbal Bearing - Replaces 30-879194A01 and 18-21006 Non-greasable gimbal bearing for Mercruiser Stern Drives. Gimbal Bearing for MerCruiser Alpha Gen II, Bravo, Bravo X, Bravo XR & Bravo XZ. For 1998 & later Alpha Gen II, Bravo, Bravo X, Bravo XR & Bravo XZ. Also crosses with: Mercury 879194A01 | 862540A3 | 862540A04 | 862540T1 Sierra: 18-21006