Re: Saved from the Junkyard 25r70e
I think the Impeller repair would be just the impeller (maybe the impeller key also). The Water pump repair kit would contain (depending on which one you bought) the pump floor plate, water tube grommet, shaft o-ring, possibly even the pump housing.
If you open up the pump housing and see it scored or scratched up in any way, you need to replace the housing or else it could tear your new impeller apart or cause premature failure. If this was a "saved from the junkyard" motor, I would at least replace the impeller, water tube grommet, and shaft o-ring, as those parts are made of plastic/rubber and are likely to have deteriorated if they had not been recently serviced.
Rgds