Jackson if only the u-joint went bad it's an easy remedy, and done at home. U-joints can be had locally so no need to special order. If I were you though I'd do all three at the same time so you know what you're dealing with, and make sure they are all serviceable so you can maintain them (unlike the ones that came stock.)
While the Dodge Durango phenomenon has been floating around all of the of forums, nobody I've talked to and nothing I've read has anything specific on what year, make, model, engine, etc that would work. For now I'll be happy rebuilding my own.
PM me if you need some u-joint cross reference numbers.
1973 Series III
1995 RRC LWB
2000 Discovery II
2000 Range Rover