*** This is a brand new inner and outer ball joint to repair the lower control arm of one side of the car; either left or right control arm.They will fit all E30, except M3. BMW doesn't sell this item as they will only sell you the whole control arm that list for $129.00, Our part number for your reference is B31121126253 & B31121126254, if you need both sides (left and right) then you must bid on 2 items items.  *** See our Mercedes Benz Chart for your vehicle model...