call the folks at advanced automotive concepts or stealth auto. They should be able to help you out. I have bought from advanced automotive concepts and they have great customer service and are really helpful over the phone. As for Stealth I havent bought anything from them yet but am in the process of doing so and they are great as well.
I know this thread is a bit old, but looked like the right place to post my question. I have just purchased my 2005 300C a week ago and I'm fairley sure I have stock HID lights. I make this assumption, because the lights are like no other car i've owned before (more of a pure white light). If they are the stock HID lights, what kind of bulb would it be? 6000/8000/10000?