[DirtyLarry]

My CAD reader isn’t cooperating today but I was able to dig up a layout drawing, which isn’t as accurate but pretty close.

The frame channel is taller a few feet forward of the axle but tappers down to the old C/K pickup truck sized rail toward the rear. Both rear shocks mount forward of the axle at the upper brackets just like the older trucks as well. This bracket may just work for you with a little of creativity. I have no idea what they would cost though.

I remember looking at these before thinking they would fit my truck as mine has a stripped shock mounting stud.