Actually, according to AZ Autohaus it IS the same part as for the 280 SL.
Note: I purchased from AZ Autohaus and Bosch shipped directly to me from California. I returned the first switch because it was too "stiff". Very difficult to push back in. Second one was not really much better, but I kept it. I have 3 used ones, one of which is untested, besides the one in my car.