I spoke with an outfit that purveys the 10 bolt adapters necessary to install
22.5" wheels, and they said they did not know, but to enquire on line in an
pretty close, eh?
there isn't an alt.autos.4X4.GMC-trucks that I've been able to find, but they
are fairly close in configuration to the best of my recollection.
should you have a URL to direct me to, I'll be glad to follow up.