This Left Seat Switch came from one of several W126 Sedans I have parted over the last few years and has been tested before removing.
I recently went back through my inventory and retested parts on an ‘87 420SEL before breaking it down.
Please be certain to match part numbers before purchasing.
Feel free to ask any questions you have as I am more than happy to work with you to ensure you are getting the best part for your needs.
Cheers to good health and happiness!