I've just had to replace the nearside sidelight bulb on my w221 S-class. What a job! I previously managed to change a dipped beam bulb by moving the screenwash reservoir and squeezing my hand in. No such luck with sidelight bulb. I had to jack up the car, remove the wheel and take off the arch liner to get access to the bulb. Surely these cars should have a hatch in the liner the same as humble Vauxhalls have.