Just to follow up, I have had no problems with the Perrin rear sway bar and endlinks after my install. I just finished the front sway and endlinks, and I can't believe the difference just driving around the street. I have the rear set in the middle and front set full hard and the car is on rails, at least to me. We'll see what happens when I AutoX in Phoenix this weekend.
Gotta love AutoX in January.