Sierra 18-1908 Mercruiser Manifold Riser Spacer Mercruiser GM V6 229 and 262cu.in. Models 185 and 205 GM Small Block V8 305-350cu.in. Models 200, 228, 230, 260 and 898 GM Big Block V8 454cu.in. Models 330, 340 and 7.4L Use With Manifold 18-1952-1, 18-1953-2, or 18-1957-1 Elbow 18-1970-1,18-1976-1 Exhaust Elbow Mounting Kit 18-8554,18-8554, and 18-8556 Exhaust Elbow Gasket 18-0672, 18-0897, and 18-2849-1 Replaces Barr MC-20-93320A3 Mercruiser 93322 GLM 50300 Mallory 9-40530 Osco 3320 California R