When I replaced the headlights on my '86 300E with Euro versions, I also made a simple bracket for the old wiper motor. This allows you to attach the old motor to the headlight assembly (as with the USA version).
The old wipers work perfectly fine with the Euro lights. However, the Euro wiper arms/blades are longer, enabling them to clean the fog lamps as well. Although I haven't yet tried it, one could probably use the Euro arms/blades on the the USA motors. Can anyone verify that?