A buddy of mine had a similar problem however his also involved the bearings in the pump going bad.
I used an automotive rebuilt unit. Externally the only difference was the angle of the fitting for the return line. A slightly longer piece of hose took care of that.
From what I read the auto pumps put out higher pressure and will cause the steering in a boat to slam lock to lock when the engine is started. To solve this you just need to unscrew the hex fitting where the high pressure line connects. Under this is a spring loaded plunger and "stuff" that will come out once the hex fitting is removed. This is what controls the pressure. Just swap everything in there from one pump to the other and it works like a champ!
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