Rear camber plates?
 

I haven't found anything about rear camber plates for these cars? Is there a thing for rear multilink suspension?

No. The damper doesn't have squat to do with camber in the rear of this car, or on any end of a car that doesn't use an actual strut (the spring over the damper is not the definition of a strut even though most struts are that way).

However, I can help: http://www.stranoparts.com/partdetai...258&ModelID=36 along with http://www.stranoparts.com/partdetai...258&ModelID=36 will give you camber adjustment. Note you can't run the camber adjusting bushings without the other set..... :)

i think it would actually be impossible to adjust any upper plates in the rear if you have seen the little hole they're mounted in

^^ Impossible or not, adjusting the angle of the shock wouldn't change the camber at all. Rear camber is dictated by the relative lengths of the upper control arm and lower control arm. If you want to change camber you have to lengthen or shorten one of the two arms.

After looking at the rear suspension geometry, this makes more sense. The damper is mounted in a way where the wheel hub angle wouldn't change.

Rear suspension geometry:
http://i.imgur.com/dm0hel.jpg

If you look at the front strut, moving the damper will change the angle of the wheel hub.


Front suspension geometry
http://i.imgur.com/GmiEgl.jpg