Well, I wound up going to
http://www.car-part.com and getting a 1997 Z3 1.9L rack (2.7 ratio) for $220 shipped. It has 105k miles on it, and the guy assured me it was leakless. Apparently they usually don't sell the racks, but rather send them out for rebuilding & then sell them. He He said they only sell one if it has no leaks whatsoever. For $220, who cares.
Stuck (Jordan) said that rebuilding them is a real PITA, and damn near impossible. Anyone tried it before? Now I have one to practice on lol.