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Darren,
I have the same scenario. My Johnson mechanic is
getting an extension kit for me which is essentially
adding a 5" spacer housing and using a 20" shaft.
He tells me that the 20" shaft models came with
this spacer already in from the factory. It has to
be a 20" shaft to work with the Montauk and be
able to just hang onto the transom.
Keith