FYI - All OEM HIDs use 4300K, which is the purest white and best light to use. Up to 6000K it technically acceptable, after that, it just gets ricey and the output is not as bright, even if it 'looks' like it is. You can go down to 3000K like Le Mans cars :lol: but it will be yellow, and won't exactly be the easiest thing to deal with, IMO.
All HID bulbs are D2S, then they usually are listed with a dash and the Kelvin rating. I'd skip changing them, money well spent other places.