Check with any tractor-trailer repair shop. They should be able to refer you to a local driveline specialty shop. It's probable you will need to take some measurements and have one or more shafts made. Fortunately, commercial vehicle driveshafts are pretty generic- - -brand names don't have a lot to do with what's available.
Jerry

"It is better to be silent and be thought a fool than to speak and eliminate all doubt!" - Abraham Lincoln
Cringe and wail in fear, Eloi- - - - -we Morlocks are on the hunt!
There is nothing noble in being superior to your fellow man; true nobility is being superior to your former self. - Ernest Hemingway
Love your enemies and drive 'em nuts!