Sierra 18-2750 MerCruiser Exhaust Bellows Replaces 8M0124227 This Sierra exhaust bellows is designed for use with MerCruiser drives. Application Info Fits MerCruiser Alpha One Gen I drives from 1983-1991 with serial numbers 06225577 thru 0D469858 Fits MerCruiser Alpha One Gen II drives from 1990-Present with serial numbers 0D469859 Up Fits MerCruiser Bravo I, Bravo II, Bravo III drives from 1988-1998 with serial numbers 0B664190 Up Interchangeable with GLM 89100 Mallory 9-72703 Mercruiser Ste