I presume that the 1.8 front and 2.2 rear
you have posted have nothing to do with the current spring pads...otherwise you didn't want to know what your current pad size is.
If you still have the original (by MB) mounted spring pads, you can go to the MB dealer and get the thickness by using your VIN# or chassis#. The MB compu should be able to give the part# of the factory used spring pads.
If you are lucky, you can see some "dots" on the edges of the current spring pads after you dived under the car with a flashlight. The number of dots resembles the type of spring pad...1 dot for 8mm, 2 dots for 13mm, 3 dots for 18mm and 4 dots (front only) for 23mm thick spring pads.
with a minor 600+k