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Generally Found On OMC GM Cobra 5
but the drain plug type is important as this will dictate the oil block you can attach based on this thread type
Should be compatible with
1955 1956 1957 1958 1959 1960
470 485 488 165 170 180 190 3
Mercury Outboard 500 50hp Water Pump Impeller Housing 46-32767A1 46-32766A1 Base NOS Generally Found On OMC GMItem Details Removed from a 70's Mercury 50hp 500 Between Serial # 1770179 2116317 Overall Good Condition Bearings may need to be replaced Part #'s Top Water Pump Impeller Housing: 46 32767A 1 46 32767 46 60366 Base Assembly 46 32766A 1 46 32766 46 39531A 1 46 39531 These Parts May work On some others 400 40hp 65hp 650 35hp Freshwater used part. Includes all parts in picture If you have any questions at all on compatibility, please ask before