Paul,

Thank you for the reply - I'm going to take the tail light lens off of my 2000 ML 320 some time in the next few weeks and have a look at what's there, since my tail light system currently only lights up the rear of the car (the back of the tail light) and the side marker part (athough there appears to be space for a bulb, from what I can tell by looking through the tail light lens) is currently not lit up.

Hans