Date registered: May 2007
Vehicle: 2003 Mercedes Benz E500
Location: San Francisco Bay Area
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If you have trouble getting...
the diagram, the actual change over should not be all that difficult. I swapped out the dreadful US setup on my W124, 400E, and all that is really needed is a good test light, a multimeter and a friend to run the rotary and directional switches through their stages. For the W107 it cannot be all that different.
I purchased the proper connector housings for the Euro lights, removed the original plug casings leaving the soldered on connectors exposed, and using a test light, made a chart of which connectors went "hot" as the various switch functions were activated.
You can trace the leads inside of the lamp assembly housing and match things up pretty quickly. Insert the connector pins in the appropriate holes and you are good to go.
I had a source for the plug/connector housings, and that helped a great deal.