OMC Volvo Penta U-Joint Bellows - SX & DP-S | Sierra 18-2765 Replacement U-joint bellows for OMC Cobra & Volvo Penta SX, DP-S model stern drives. Sierra U-joint bellows Fits Volvo Penta SX and DP-S stern drives Fits all OMC Cobra clutch dog stern drives from 1986-1993 Replaces OMC 983973, 987467, 3854127 Replaces Volvo Penta 3854127, 22197130 Replaces Mallory 9-72707