There is some info in our wheel and tire tech tip, in a chart near the bottom, although it is mostly for AD trucks the notes cover some later ones.
http://www.stovebolt.com/techtips/wheels/Also in that tech tip you'll find a link to the Accuride wheel catalog, it is a great help and should also have the nominal dimensions you're looking for.
The patterns you're probably going to be dealing with are 10 lug on 7.25" circle with a 5.25" center hole.
And 6 lug Budd stud centered on an 8¾" Bolt Circle, with a nominal 6.50" Bore.
If looking for 22.5" 6 lug Budd wheels send me a PM, I may have or can find some.
They are also available new from a good truck tire shop that can order form Accuride.
Grigg
