I've been looking for camber plates and the E36 plates all appear to be clocked 30 deg off for the Backdraft (two outbd studs are parallel to the centerline of the car on the BDR)
The E30 plates appear to be clocked correctly and both models (E30 & E36) share the same spring seat bolt pattern but even then I'd installing them on swapped sides to make them work it appears (two studs are inboard and parallel on the E30 installation).
https://www.chicanemotorsport.com/v/...ccpe30SP-2.jpg
All that being said I seem to remember seeing a Ground Control camber plate for a BDR photo on this site recently but now lost it or maybe my mind...