My '04 ML350 takes an H7 bulb, which should cost you around $10, give or take. The $200-some deal is some kind of misunderstanding, unless you DO have HID lights. Replacement is simple, except there is barely enough space to fit your hand through. In Russia, I just paid $7 for the bulb and another $10 for the labor, as I couldn't manage to do it on my own. But now I know
The right side looks even more inconvenient, since there is really no space because of the airbox.