Mecruiser Power Steering Pump (automotive equiv.?)

[jwright]

I think the power steering pump on my 1976 280 TRS Mercruiser is tired. At high rpm I get a a noise that changes depending on steering system loading. It is hard to describe, it is like a grinding, rattling sound...
I looked at a merc pump and they are are $$$. I know it is a GM pump. Does anybody know if it is off a 1/2 ton, Camaro, Malibu etc... It would be nice to get a new one cheap at the auto parts store. I also think I will have to reuse my resovoir, the new square ones will probably not fit. And finally, how do you swap the pulley onto the new pump.
THANKS!!!!

[turbo2256]

The guts can be replaced as a cartrige assy. Had it done to mine after the heat exchanger ruptured and dammaged it. It is an automotive unit. Check your yellow pages.

[clayman]

I tried really hard to figure out if there could be any difference in the Marine vs. Auto steering pump. Water pump yes, steering pump no, so I went down to Discount auto and got one, I want to say it was under $40? and is working great.
James