The ball joint bolt is a torx bit. When ive fitted these arms before ive replaced the nut and bolts to. They are easy enough to do. Im sure the bolts that hold the arms on are 15mm and the nuts are a 18mm but i could be wrong. The way ive done the arms before is to remove the 2 bolts that bolt the arms to the sub frames and swing the arms round with the all joint bolt Removed and then hit them with a hammer to remove the arm from the hub. Then when refitting use a philips screw driver to line the holes up for the new bolts.