I found this video from the Global West booth at SEMA in 2009. It explains why at that time they used a method in their coilover conversion kit to put the coilovers where the SPRINGS were.
The brackets they sent me will accomplish this. The axle housing brackets I have are going to be mounted a little differently, but very close to this.
I would guess they changed to the strictly bolt on kit w/crossmember (for added strength) because of having to weld with this setup.
https://youtu.be/cxGpw-10L5c