Attached pic shows the "long" (5.8" center to center) pitman arm off of my RS. Although it is not the best pic, you can clearly see that it is the long pitman arm as opposed to the short (5.25" center to center) pitman arm.
From what I've read, and someone will correct me if I'm wrong, the "faster" version of N44 for Z28 and SS uses the longer pitman arm and shorter outer steering arms, but with a manual steering box that has a different internal ratio than the power steering box on my RS.