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For R/MR/Alpha One From 1976-1990 Mercruiser Sterndrives. Kit includeds both Style water hoses (3/4" & 5/8"). Includes an exhaust Tube for Extra horsepower and louder engine operation. If you are looking for the Regular transom kit the part number is 21950. The 21950 kit is the same as this kit (21951) But instead of an exhaust tube it has a exhaust Bellow. Both will work on any Alpha One Sterndrive 1990 and before, but the exhaust tube will provide a little extra horsepower and engine operation will be louder.