There is a trim kit available from Pioneer that turns the hole into a double-DIN. You might have to order it using the Euro part number, it has been talked about before. Use the Search and you will find threads with pictures, links, etc. Here is one example: http://www.benzworld.org/forums/w203-c-class/1377422-feeler-avic-d3-pioneer-dash-navigation.html Also you can install a Parrot bluetooth kit at the same time if you want, even uses steering wheel controls. Bose folks don't get things so easy as you.