The part number you gave 001 140 20 60 shows in the parts info as a part that I remember as being about 2in in diameter. It doesn't directly look like item 90, but item 90 is the graphical representation of the vacuum amp to the EGR which is what the picture in the parts info looks like.
Your descriptions sound more like one of the thermal valves item 79. The distances on the image aren't representative.
Bosch Master, ASE Master, L1
33 years MB technician