camber is adjustable on both the ball joint bolts and on the strut mounting bolts, even with the non adjustable bolts in there will be a slight amount of movement which can lead to slight camber errors, Also VW sell a replacement bolt to allow more adjustment to be made if need be, On my ETKA it is part number N 101 740 01, the thread size is the same as it uses the original nut on the other side, the shoulder of the bolt is smaller and also the head of the bolt is 18mm instead of the standard 19mm. I know this as I have one of them fitted on my car.