It fits next to the Gimbal Bearing in Mercruiser stern drives including:120 / 140 Drives from 1978-1982,165 from 1978-1981,260 from 1978-1982,470 from 1978-1982,485 from 1980-1982,898 / 228 from 1978-1982,R / MR Drives,Alpha One Drives,Alpha One Gen II Drives 1991 and up,Blackhawk Drives,Bravo 1,2,3.