For the CARK-91, you can either get a dash-mount bracket which clips behind a dash panel, and will not involve any drilling, or you can get the MB Original Console - again no drilling, and mount the phone kit on there. - you can get a lead from dash-mount to fit between the car kit and the ISO Connector on your stereo, to make wiring etc. much easier and have the phone played through your audio speakers.
I think fuzzer is fitting one to a W210 - so might be worth asking him for any tips he has !
For microphone - run the lead under the dash, slip underneath the rubber door seal, - run up and around the door, and mount underneath the drivers side ceiling grab handle with thin sticky velcro - easy to remove if you need to and job done !
I have been trying for ages. I finally won one last night. Its at times like this you wish you had b/band. I am not installing it myself as I have trouble changing a plug. God I didn t realise it cost so much to install them. I need someone from word of mouth as I don t any monkey with the job.
I am glad SYM that the solution you have provided and will request that when I find someone to fit it.