Junk yard for the plug. There's has to be a lot on ng actuators out there. Try Potomac MD & FL locations.

http://www.mbpartsonline.com/

FYI If you go shopping for a used one, I understand when getting another throttle body (actuator) the serial number of your car is relevant.

Bob
PS I now list members would be very interested in pik of your accuator's innards. If you have digital camera, but not capabilities to post here, email me the pik, I'll format it for posting by you or me.