I just installed a set of Pete's Delrin bushing's in a set of LCA that I'm rebuilding. The bushing is designed to fit in the entire opening of the previous rubber bushing, thus eliminating the outer shell. It should provide for a more linear movement I suppose, since it's all one piece rather than a bushing and a shell. The pin is pressed in with the bushing all at the same time as one piece.
Pete recommended using this grease
http://www.jegs.com/i/Energy+Suspension/355/9-11104/10002/-1 and here's the pivot shaft
http://www.americanmuscle.biz/34571_lower_control_arm_pivot_poly_p/34571.htm
designed for the new delrin bushing. That grease I guess has helped eliminate a lot of squeaking so a greasable pivot shaft isn't needed. I think Hotchkis ending up using it to eliminate some persistent noise problems.
