Buddy and I bought an H7 kit for a car. They are 5700's. We split the pair, and to make a long story short, it cost me 120CAD (90USD) to install a HID on each bird.
They had the seperate balasts, the wires were a little long so we cut them down by about 4", and installed the igniters on the flat black plastic piece below the headlights on the nose of the bird.....so far so good.