I have the FROR pitman arm. The difference is fairly minimal, but if it's really close, it works, plus it's a little flatter. The shorter pitman arm does make the steering slightly slower, but it's not bad and frankly, I think slower steering is better in a tall, fairly unstable rig.

But if that won't work, you might consider relocating the axle back a bit. You can possibly redrill spring perches and locate the springs back a bit or get some relocation plates from All Pro. That should do the trick, if you don't mind the axle not being as far forward.