just because your beams are 6" over does not mean there is a standard swinger. You will need to work with where the beam and radius arms pivot and where the steering arm is located on the spindle.
I beams are very difficult to make work correctly..... A good design takes lots and lots of time. Good luck!
As Jerry stated, most of these set-ups are built to the truck and are not standardized. . .a lot of work and trial and error go into them and there is quite a bit of fabrication required, but that's not to say that you wouldn't be able to figure out the steering set-up on your own.
Like I said. . .start looking at all the pic's you can of the different steering set-ups the well set-up Rangers have. If you can weld and cut metal proficiently, along with some fabrication experience you should be able to fabricate a steering system for your beams.