W209 CLK are the same as C55. Either its a XENON/HID or halogen - your picture has one of each. Either will bolt in, but they are not interchangeable - the harness is different and the HID/XENON have high voltage power supplies.
Slideshow: A one-of-one U.S.-spec Mercedes-Benz SLR McLaren Roadster became even rarer after a factory-backed transformation at McLaren's headquarters.