If it is the truck I think it is there is not too much of the '78/'79 Bronco left body wise. There was a build somewhere on the net of this type of truck. He took a pickup & cut everything he needed from the truck to make it a Bump Bronco. He put the roof panel from the pickup, door jambs, extensive work in the rear to make all that work back there. If I remember correctly the front portion of the floor is bump grafted into the Bronco rear floor panel. The build might even be here at FTE if someone did a search for it.