The kits I use come with the impeller, upper housing, and gaskets including one for the water tube. If you decide to replace the lower housing, make sure everything is very dry. When you remove it, you are open to the oil reservoir, at least on the V6 models.
I haven't used Sierra kits, but their other stuff seems to be OEM quality. Be sure to rotate the shaft in the correct direction when seating the impeller in the housing. If you go the wrong way, your new impeller will be damaged.
BTW, the wrestling and swearing comes when you're reinstalling the LU and you're trying to line up the splines on the drive shaft.
Dave
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Blue Heron Boat Works
Reinventing the wheel, one spoke at a time.
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