If I had a digital camera I would take some pictures. All I know is that on my car there was one of those special threaded twist shafts that when turned in either direction lengthens or shortens the distance to the cable. I would suggest just take a good look at the throttle area, try to find a cable that goes down to the transmission and follow it up the the throttle area.
1992 Mercedes-Benz 400E
2002 Mercedes-Benz ML500