As for wheel size, I believe they will work with as small as 16" rims for 99-04 superdutys.
The 05+ use a 6 piston design. Both require the use of factory rotors for their model years.
wow guess you finally went with the big brake kit, congrats Rich. Truck is gonna be that much more awesome with those huuuuuge calipers sneaking out behind the wheels there