found out after removing the adapter plate that the studs are metric. I used standard Ford lugnuts. The weight of the rim and tire ripped the lug nuts off. All 6 studs were removed, and i put a whole new set of studs in the plate, and replaced all the lugnuts on the truck with the correct ones.
These tires are 305/50/20s
37s are too big for the gear ratio. I'm not going through that whole mess again. I'll run the bands until after winter, then with income taxes, i will buy a new set of tires. I dunno what, but likely with something that gets good mileage, looks good, and doesn't break the bank. I don't need anything with offroad performance anymore.