Yes, a few years ago is different from today; but, I would urge to keep searching... I was told that it was impossible to find a vendor willing to sell the potentiometer separately from the entire air flow sensor a few years ago. I remained diligent in my search and I was able to find a supplier.

I just called a local supplier that I order parts from and was told that the potentiometer is a part of the MAF sensor and that one can not order it separately from the entire unit. Wrong.

Keep in mind that the part number you listed is a Bosch part number... when you perform your search make sure you let the person know that the part number is Bosch, not Mercedes.

__________________
Daily driver is the blue-black metallic EURO Spec 600SEL with leather black interior on 20" Brabus V wheels