I can try...
The axle actually moves in an arc...
The trick, is to find the 2 points, from the fixed eye, and the axle, that MATCH..
Once you find those 2 points, you just build the bar to suit... possible get away with a single 2' DOM tube... but, maybe traingulate a 1.5 or 1.75" DOM tube.. eithe using heims, or poly bushings...
Really simple... just the initial measurements are the trick, maybe someone with SolidWorks can find out pretty easy... other wise, You pretty much have to go out, and cycle the suspension....
Now... the way I would do it... to limit binding, and wrap, without limiting travel, or interfereing with stock stuff...
make the front bar mount integral with the front perch...
The rear, would sit UNDER the axle, with the tube runinng the length of the leaf.. probably about 2-3 inches below it..
Sorry all, kinda hard to express this in print...
Chase