Also, a new MB servo, (w123 part listed above), is about $400 my cost. The aluminum ones are junk in my experience and the electronic hack deal is unbelievable crap. That's what I just ripped out of this car, returning it to stock but the used servo I had in my parts pile is no good.

These systems are great if everything is working properly and they haven't been "improved" by some moron. I just need to know what, (if any), differences there are between the w123 and w116 factory servo.