Not too sure why you would need a camber kit. There are 2 ways of adjusting the rear camber. Firstly you can use the eccentric bolt on the lower arm (21 & 18mm from memory) secondly the camber can be adjusted further on the upper arm. The inner bolt sits in an elongated slot. Simply loosen the bolt & manually push the wheel towards positive or negative as desired. Then tighten the nut back up, I usually add a spring washer. You will need to have your car aligned afterwards as making these changes will effect the toe setting