A friend has a 2 year old E class Merc. He's asked me to help fit reversing sensors but I think that the reversing lights are non standard in the sense that they do not use conventional bulbs (but possibly LED's?) and therefore may not have a normal 12 volt feed. The reversing sensors requires a 12v feed to be picked up from a cable going to the reversing lights. The handbook doesn't specify what, if any, bulbs to fit in any part of the rear light cluster and the MB dealer, of course, states that the job is far too complicated for amateurs! So I don't want to start pulling the trim off in the boot only to find a big problem. I'd be very grateful for some help on this.