Need help swapping from 2 speed to 3 speed wiper motor

I've got a 73 duster with a 2 speed wiper motor. Looks like I don't have room for it with the hilborn and I need to swap to a 3 speed wiper motor. What all do I need to get? Does the 3 speed motor have to be A body specific? year specific? What about the switch? And the linkage? What linkage do I need?

Thanks!
Wade