I recently swapped midsections from a 1990 90hp to my 1989 125 force outboard, I do not know part numbers. Now I have exhaust coming through the shift linkage( i think) into the midsection and into the upper cowling. Are the 125 lower unit and 90 midsection compatible? One diagram shows an exhaust seal #93, which my lower unit does not have. Also there seems to be space between the exhaust tube, see pic in yellow, and a curve cutout, in red, that seems to just be open. Whats normal and whats not?