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:
Driveshaft spline 3/4″ diameter, 17 teeth.
Add $160 for 6 1/8″ stainless steel impeller upgrade, #1737.
For use on – 40HP, 45HP, 50HP Johnson/Evinrude 2 Stroke Motors