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YOU FOUND IT!!
Forward & Back Lever: Rebuild your Mercedes W126 electric Seat Adjuster switches with this Reinforced replacement part. Please note these ref# above since there are two different, and easily confused levers like this in the switch. This improved design offers a stronger shaft, and more material in stress zones. Best of all, you can leave the switch in the door and NOT have to solder anything! ;-) Just keep the springs and metal contacts from inside the current switch. Then easily drill-out the holes in the new 3D printed part, since holes are more accurate this way. The holes in this 3D part are slightly smaller than your final inside diameter for best fit. Then reassemble the switch, and you just saved the ~$400 of a new OEM part and all that annoying soldering of all those wires! See the complete How-To on the MB Forum and YouTube!