1. Is the only issue the thread direction?
2. Are they otherwise in good condition with no cracks, and the threads not damaged?
3. Do you have all of the corresponding nuts? Do the wheels have brakes
, and if so, are they made by Dexter?
(this is a non-issue for wheels without brakes)
If your answers to the above questions are all "yes" then I would use them.
Dexter is the ONLY manufacturer of 7" trailer brakes
still in business. When my original equipment brakes
on my Fiber Stream
wore out, they weren't Dexters, so I had to replace the entire hub.