Expeditionary, the 7700 torsion bars were only put on the F-150's with the heavy duty package. You will be able to spot these a mile away as they will have 7 lug wheels (yes, 7). Not many of them out there, but they are there. You can always go to the dealership and get the torsion bars there, but that is the expensive way to get the parts.
As for the standard torsion bars, these can be gotten out of any F-150 (except for the SuperCrew trucks, they use a shorter torsion bar) and any non-air ride Expy. The air ride Expy's use a weaker torsion bar which will lead to the front end of the truck riding low unless you have the air bags to help support the weight (oh wait, you removed the air bags).