It's funny that you post this question today. I am in the process of repairing my C240 (2002) passenger side mirror that got side-swiped.
Since my mirror was already broken off, I did figure out how to remove the housing, motor controller, and LED signal module. However, since the mirroe was broken off, I can not figure out how to re-secure a new mirror to the motot assembly. Maybe someone else can help both of us.
Since my housing was OK, I bought a new LED signal assembly ($59) and a new mirror ($120) from my local MB dealer.
I had the dealer swap out the mirrors for me when I had the car in for an oil change. They quoted me $50 to do the work, but when I picked it up they said they should have charged more because they had to remove the overhead console. Still they only charged what they quoted me.