Mercruiser Exhaust Elbow | Barr Marine MC-20-76351 Direct replacement exhaust elbow fits various Mercruiser log style manifolds in I/O sterndrive applications not using a stainless steel sleeve at the water/exhaust mixing area. Barr Mercruiser exhaust elbow without sleeve Includes mounting hardware and gaskets Direct replacement exhaust elbow riser (stern-drive) Fits various 140, 165,198, 228, 233, 250, 260, 888 & 898 Models Replaces Osco 6351 Replaces Merc 76351A1, 76351A2, 76351A04 Replaces Sierra 18-1971