Mercury Mercruiser - 6" Exhaust Riser Kit - Fits MCM V-6 Carb & TBI Engines, MCM/MIE/Tow Sports V-8 Engines with Cast Iron Elbows, MCM V-8, & MIE/Tow Sports - 93322A12Raises the height of the engines exhaust system to prevent water from enetering the engine through the exhaust system. Maximum height of 9" (228 mm). Two different types of exhaust elbows have been used: cast iron and stainless steel. To tell which one you have, look at the elbows mounting bolts. Cast iron elbows use four long bolts. Stainless steel elbows use four short 1 inch (25 mm) long bolts. 6 inch (152 mm) Fits the following models: MerCruiser