4x4AT stock a range of tow bar electrics for the BMW X3, both 7-pin and 13-pin. The 7-pin type plug has fewer options than the 13-pin - which are the basic legal and safety requirements of brake lights and direction indicators. A 13-pin plus allows for more wiring connections such as fog and reversing lights. We offer a professional fitting service for all the BMW X3 accessories we sell, available at one of our UK installation centres, contact us for details.