Ouch. not cheap is right.

What year did MB start using this in the W126?

I removed the fan assy on my '86 W126 from under the glove box are to clean of dirt/devris and then lube the bushings to extend its life.

Here is the offending part mentioned above. What years/models did this appear?

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85 300D 3 pedal. Current project.
83 300TD (need rear wiper assembly dead or alive)
84 300SD Daily driver
85 300TD almost 400k miles and driven daily.
98 E300D *sold
86 300SDL *sold and made flawless 10 hour journey to new home.