Why not just change the armature, assuming the rest of the motor is OK. ARM20 from Qualtex will do the trick.
The new motor kit is 1604822 and usually includes wiring mods. If not just use the original plug, snip off the lugs, make sure you identify the two connections going to the tacho on the old motor, line these up with the wires to tacho on new motor and it will work perfectly.
digi kit is now sold on its own 1604976 .the FHP motor is much the best option if the customer will run to it as the bigger bearing mean smoother quieter running