I called the guy, they are selling fast, and he says any standard semi truck wheel will fit them, so a set of "super single" rims is all you would need to have (14") wide rims.
He said they are new Axletech (formerly Rockwell) with air lockers, and the wholesale price (not retail) is over $23,000 each. He even tried to trade me straight across for my HP D60.
Good news for many of you guys, he said someone bought a semi-truck load of them and is having them shipped to Colorado. Unfortunately I'm sure they won't be $500 each when they arrive.