The escentric bushings were available from Dinan (the BMW specialist). The Sept/Oct 1986 Star magazine had an article on it. The dealer may have them too. Your car does not have the hydropuemtic shocks. Once again, if your springs have not sagged or the control arms bended, the only solution to change your overly negative camber is the escentic bushings.
You may want to contact George Murphy of the Star Magazine for your problem. You can reach George at firstname.lastname@example.org