My very expensive comment applies to every part of the SLK's electrical system not just the optics, it's very complicated and very temperamental.
Dension make a unit with an optic interface, purchase that then get a hold of your local dealer and explain the situation to them, they will more than likely be happy to install the unit for you and will have the kit to work on the copper and glass side's of the system without damaging them.
The SLK is not one size fit's all compatible so taking it anywhere other than the dealer is very risky, i'm sorry i know 90% of people don't want to hear that but that's just the way it is.
__________________ One thing you will learn with German cars - If it's simple it ain't happening. |