(a) Any motor vehicle may be equipped with not more than 2 side cowl or fender lamps which shall emit an amber or white light without glare.
     (b) Any motor vehicle may be equipped with not more than one running board courtesy lamp on each side thereof which shall emit a white or amber light without glare.
     (c) Any motor vehicle may be equipped with one or more back-up lamps either separately or in combination with other lamps which shall emit a white or amber light without glare; but any such back-up lamp or lamps shall not be lighted when the motor vehicle is in forward motion.