I believe that the maximum size of rims/tyres you fit may also depend on which W202 you have...
Last I checked, the Sport and Esprit were lower than the Classic/Avantgarde.
Additionally, if your suspensions are tired, you may have some issues.
I had 18" or 19" (can't remember) from an S-class fitted to a W202 Esprit... they did fit, but at full lock would rub (and I had to be VERY careful over speed-bumps)
Make sure you post some pics once you get them on!
Michele