That pictures show you how to mount the rear spring using the original radius rods too or at least some from a 35-40 Ford. I like that kind of set-up. Pete and Jakes, Speedway, Yogi's, many others sell kits to do what your asking. Most of them sell the kit to mount it behind the axle. I think Speedway is your best bet. I recommend getting the catalog and looking through it as oppossed to surfing their site. Sometimes I find what I'm looking for easier that way. You can either mount it behind, in fornt or on top, it's all preference I guess. The way the picture shows it will probably be the cheapest way to do it.