I had very good success with a local family-run trailer sales and auto parts place. I made the necessary measurements and they ordered the axles for me based on my order form. If you can make the measurements, find a parts place that does business with Redneck Trailer Supply. They are a Dexter distributor. My place gets a truck from Redneck twice a week so there was no freight charge.
Here is the order form I used to order my axles.
My 2002 Classic and my 2001 Safari both had Henschen axles. I had to elongate one mounting hole on each axle bracket to get Dexters to fit in the trailer mounting brackets that were designed to mount Henschens.
The new Dexter's are slightly different resulting in a need to modify the shock brackets to make the shocks fit properly. The swing arms on the Dexter axles were about 3/8" further from the frame than the arms on the Henschens. This was discovered after the axles were delivered but caught and a fix suggested by my installer which we implemented on the fly. He cut the shock mount and spaced it out about 3/8" with some steel bar.
That modification is depicted in the third picture in Post #60 of this thread:
The title of the thread is Disc Brake Conversion Success. Don't let that fool you - I changed the axles and converted to disc brakes at the same time.