Do a search for wheels at Acks' FAQ (the link is in my signature, below). There you will find a list of compatible truck wheels.
Be careful!
Some of the wheels will have the right bolt pattern but the wrong sized center hole!
Be sure to measure the center hole on your truck (I can't remember exactly what the correct measurement is) and make SURE that the center hole on your new wheels match too!
Tip:
Full-sized Ford Bronco wheels work... I bought a set of four for $40 at a Ford Truck junkyard.