Off the exact topic, but the front brakes taken off a late model (2008 and newer) E-3/450 being converted to 4x4 make a huge upgrade in driving and stopping performance on 2007 and earlier chassis year. A hard stop graduates from "wishing for more brakes" to "there's always more brakes."
I got my parts from Quigley in Pennsylvania, and the "kit" I bought was axles, radius arms and all. Even came with front shocks and a couple tie rod ends. I had to buy new Radius Arm Bolts and Nuts, Brake Hoses, and the upper Nut/Washer/Bushing combo for the Shocks. A No-Drill (or Grind, or Cut or File) installation. Re-used the Master Cylinder.
This swap is less expensive than a full front brake job (calipers, pads, rotors, bearings) or a suspension re-build (ball joints, bushings), and the Radius Arms are an updated design.
Quigley will also sell Brakes Only. That'd be Brackets, Rotors, Calipers with Pads, Splash Pans, and ABS Sensors. I re-used my Sensors because the connectors on our 2002 E-450 were different than the new (2012) ones. Sensor end was the same. You'd be on your own for the Hoses. Got my Dorman hoses on Amazon. All the other stuff mentioned above, I got from Ford.