I'm picking up my CLK tomorrow and so will be be doing the install tomorrow too. Any advice on microphone positioning would be very gratefully received.
Can't help with the cable, but my CLK has the mike built into the base of the rear view mirror - works well for both driver & passenjger.
Most people using handsfree kits seem to put the mike on the visor - the ones I've tried work well for the driver, not so well if the passenger joins in (you may regard that as a plus point...).
Ian.