Jet kits come with all the hardware you need to convert your motor to a jet.  (You will need to use the water pump off of your existing lower unit.)

Notes about this kit:

Starting in 2006, tiller handle shift cable assy #2043.

Med Jet Kit

For use on – 75HP, 80HP, 85HP, 90HP Mercury/Mariner 2 Stroke Motors

Price: $