faceplate

Which face plate do i need to convert from the single din to a double din space on my C180K sportcoupe - June 2004 model? Its the plastic rectangle that hides the gaps on either side. There is 2 different ones for the 2004 models for the ones part way into 2004 and the ones in the second half...

Having to replace Audio 10 Head unit, fault on one side of speaker system, cant figure out how to safely remove walnut face plate, car is a 2001 S class, 220 chassis, searched for a thread but nothing has come up, anyone done this before? would like some help on this if possible dont want to...