I had the passenger side rear drain pump crack on me to where it started leaking. It looks like a super tight fit, but there's actually a bit of room to work with once you get down there. I was in a hurry that day to get it fixed and back on the water so I cruised by Boaters World which only had a 550gph pump that had similar demensions. It's an easy fix with a hack saw and screw driver.
I still haven't replaced it with the correct pump so that sack always drains slower. What can I say, I'm ghetto like that.