I have seen that conversion on a CJ7 with full length Wagoneer axles. The owner fabricated some mounts that were welded to the sides of the frame for the front axle. The wagoneer axles are about 4" wider than stock wide-track axles(2" per side). There didn't appear to be any problems with making mounts and adding them to the sides of the frame. I don't remember if the factory mounts were removed or not. On the rear axle the spring pads were moved in to match the factory CJ axle. Let me know if you have any questions. Maybe I will remember more about the install if you ask me.