When in doubt - improvise!
1) I cannot believe that they are not available - how about right from Mercedes?
2) If a fuel filter is put in just before the distributor -and the screens are not available- can they be eliminated with the added protection of the filter?
3)If Mercedes doesn't have them - can a similar screen be used from another car manufacturer?
Just a few ideas to do work arounds. It seems like I have to do work arounds a lot lately.