THe back seat out of a an early bronco would work well for this. The 3 seat belts are all lap belts and they are mounted onto the seat. All you'd need to get are the 2 front pins, their mounts that attached to the floor, and the rear mount and bar that attaches to the floor. If you put it all on 2 inch blocks or so, I"d bet you'd be able to do it without cutting a hole in the floor where the bronco's rear mounting point was depressed into the floor.