I recently bought a 2004 636 that has HID's and the LAP light and the brights are both burnt out. What kind of bulbs should I replace these with and can someone give me a how - to on installing them? I hope I don't have to take apart the whole headlight, from what I can see there seems to be a twist off behind the headlight? I tried a search and there wasn't anything with images to give me an idea on how to get this fixed! Any help is appreciated!