I would take a look at whatever HID ballast you are considering and look specifically at the voltage range it will need to operate and go from there. If it has a fairly wide range of operable voltage, it will probably function fine, albeit the ballast and bulb's life may be decreased some. try www.ddmtuning.com or www.starrotor.com since they sell pretty affordable kits in singles. you could also go ahead and get a kit for 2 headlights so you already have a backup on hand. Ignore everyone who isn't helping simply because they feel the need to chime in without knowing the answer.