I had already read the Tech. Tips and all the info. provided by Grigg above, but the info stops at 49 and mostly deals with 10 hole wheels. Cannot find anything dealing with the 6 hole piloted stud type...
In the tech tip is a functioning link to the Accuride wheel catalog. It has some good charts and info as well as new replacement 22.5" 6 Lug Budd wheels (page 17, part number 28157)
For more info you need to search for it
TRY THIS As I mentioned earlier you can find good used 20" or 22.5" wheels with the 6 lug Budd stud centered bolt pattern.
Grigg