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Which lower units fit my motor

Kimbob

New member
I recently bought a boat. It is powered by a 1990 Mercury 115 with a pump. I want to swap the pump for a prop. Which lower units will fit my motor?
 
If the year posted is correct you need a 1988 up 4 cylinder 2.07:1 lower unit. This includes 100/115/125hp motors.
 
is there a specific part number to look for? "1988 up" how far is up? '99? I'm assuming I'd need to stay with a 2 stroke vintage?
 
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