I would love to buy a number of those potentiometers if they are indeed Bosch. The quick check of my Bosch supplier shows that part number out of stock but rather cheap.
I might call the tech line at Bosch after they wake up. Are you saying this source is out of Russia? I have seen the tech sites and downloaded wiring diagrams before. Did you buy this from them?
Bosch Master, ASE Master, L1
33 years MB technician