HELLO, WELCOME TO VVME HID CONVERSTION KITS. 
Now more and more cars are using the standard single bulb design. how is the bulb going on ?If your car use one bulb to give High beam and another bulb to give Low beam, that means you current bulb is Single beam model. Then the HID conversion KIT should be bought accordding to your current bulb types. The new one can be installed in your Low, High, Fog, or any housing. While, single beam hid kit, one hid kit can give you only High Or Low, if necessary, just buy 2 sets.Hope this can help you . 
Have a nice day .