i have a McCulloch 6000k HID kit, comes with the Ballast and bulbs.... all you need to do is splice into your exhisting wires and wire it up to the ballast and put the bulbs in and they work. The size is H1 they work fine, if you use a different size you can probably grab some other bulbs off ebay, it is interchangable. Asking $260 OBO... it has about 50 hours on it, put it in my 240sx which was barely driven and took em out because i upgraded to TSX projectors which use a different kind of bulb and ballast....