Have you refreshed anything else in the rear end? There are several wear items there that affect camber and toe; if you're getting abnormally high wear on the rear tires (I'm guessing they're wearing on the inside edges, since you're going after camber) toe is actually the more likely culprit. I've got the parts on hand to do a near complete refresh on mine; ball joint (33326767748), integral link (33326770749), guiding suspension link (33326774796) and wishbone (L-33326770859, R-33326770860). If you haven't replaced any of those parts, putting a camber kit on it might be a waste of time & money.
Here's a couple of threads with good info on suspension bits:
http://www.xoutpost.com/bmw-sav-foru...uspension.html
http://www.xoutpost.com/bmw-sav-foru...l-carrier.html
There are probably a lot more threads around; search is our friend.
