WTB looking for merc/mariner lower unit

[mutigers]

Anyone have a merc/mariner lower unit that will match up to a 1988 mariner mag 2 150hp!! Looking for 1.87to1 gear ratio and 20" shaft with 4&3/4" prop hub.... Anyone be of some help or know of some leads to where one might be. Also any casing or complete lower part numbers that will work for my application. Guess from what I can find is XR6 model lower from a 175-200hp is what I need?? Does this sound correct?? thanks in advance fellas 417-214-4986 text works good as well

[ASPB]

I have a complet 1988 mariner 150 for 2k. Motor is in very good shape and clean.