My car is only 8 years old. I'd be a bit upset to find the E- meant Endoflife-class.Mercedes-Benz will also sell you secondhand parts through their 'Used Parts Centre' :- http://www.mb-atc.de/englisch
"M-B atc sell only genuine Mercedes-Benz parts which have been carefully dismantled from end-of-life vehicles and which have been stringently tested to ensure they still meet Mercedes-Benz specifications . These parts come with a warranty at a cost saving over new parts."
But it's interesting to consider how much things have moved on in 12 years, that back then they were an option you would not consider having.
I shudder to think how much replacements cost nowadays, with dimming glass, lane sensors...