Pitman arms are handed. If you lay them flat on a their back with the ball upright, the one that twists to the right is lhd, one that twists to the left is rhd.
I'm not aware of any vendor that sells a shortened rhd pitman arm. You could however, at your own risk, heat and twist a lhd arm to fit. My buddy has done it and I plan to do one soon.
Regards
Juggs