im not sure of what size... but im sure someone knows... but the upper control arms are connected to the body w/2 bolts. If you use washers behind those, it pushes the top out, in effect adding positive camber. I would only suggest using this for ~ 2 degrees or 3-4 washers on each bolt though. If you have to use more than that, you will have to find what length the bolts are, and just get slightly longer ones than stock but that are still High quality since you wouldnt want one snapping.