GM actually still has plenty of new roof rails. From what I understand, the problem is the company that made them for GM royally messed up and produced either 2 left, or 2 right (I forget which) sets instead of left and right sets.
The fact that they come on both 2-door and 4-door GPs is what started the whole "are they 2 different #'s???" myth. It certainly does not serve as evidence that they're the same. Anyhow, as I said in the original post, I realize most people already know this. Regardless, every time a discussion about roof rails is raised, a debate erupts about this. I figured I'd end it once and for all since I had the good fortune of finding these, being surrounded by an overabundance of w-bodies, and my camera on me.