Most cars use the standard single bulb design. If you car use one bulb to give High beam and another bulb to give Low beam, that means you current bulb is Single beam model. You should buy the HID KIT accordding to your current bulb types. They can be installed in your Low, High, Fog, or any housing that will accept this bulb type. While, single beam hid kit, one hid kit can give you only High Or Low, if you want both, you have to buy 2 sets.