Seems like every website has got a different part number and kit for a 99 120...I havent taken mine apart yet to be able to recognize it when i see it. Does anyone know the part number I should be looking for? SELOC isn't any help when it comes to part numbers. Thanks.
Have you checked the mercruiser.com site? They list a pump kit and list the impeller and impeller key separate.Here are the numbers.You can see if any match with what you found.Waterpump kit - contains housing ,wear plate ,and gasket P/N 81275A2Impelller - 47-43026T2Impeller key - 28-43037