SX Outdrive Mounting Gasket | Sierra 18-2699 Includes drive to bell housing water passage o-ring & yoke o-rings for OMC & Volvo Penta SX stern drives. Sierra SX outdrive mounting o-rings Fits OMC and Volvo Penta SX stern drives Includes water passage o-ring and two yoke o-rings Replaces Mallory 9-62606