I was just about to post this link for you when you beat me to it!
Porsche Rebuilt Control Arm - Rear Track Arm: Steering and Suspension & Control Arms and Related Parts
Do note that going from rubber bushings to polyurethene bushings is not going to increase your comfort, but decrease it a little with every suspension part you put on the car with poly vs. rubber. Upside is it lasts a lot longer.