Sylvania makes an HID replacement kit (for 7" rounds). The lack of sufficient weatherproofing behind the headlights, combined with the shortness of the high voltage wires might make for a difficult time with the kit. I'm returning mine in favor of xenon bulbs instead, which allow the use of the stock wire harness (or at lease a similar wire and weatherstripping).

Also, as far as high and low beam, the low beams are HID, the high beams are hallogens, and one side of the system's low beam. The wires are spliced into the stock wiring to the high beams, and the lows trip a relay to the higher voltage wiring, ballasts, etc.

This is the problem with the majority of retrofit HID kits out there.

Not to mention the stray light because the lens/reflector are not designed for HID. It's better to upgrade wiring and relays for now and wait for a true high/low HID assembly in 7 inch.