The trim tab pump and power trim pump are very easy to identify , they're also normally back against the transom.
Power steering pump is normally attached to the front of the engine , also easy to recognise.
The only other one would be the Drive oil reservoir which Merc usually installed on the port exhaust manifold.
You don't happen to have a closed cooling system do you ?
If you have something really strange there , maybe a few pics would help clear it up .
Just because something's old doesn't mean you throw it away !
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