Part numbers and schematics for MB
 

I found this site that will take a MB VIN number and give you schematics as well as part numbers. I am not sure how up to date the numbers are but even if they are old it would give a good starting point.

Part number site

I did not look to see if this was posted else where so my apologies if it's a dupe.

Cool. Its not showing a part I need, but I found the part number for something else. Nifty!

Mercedes Benz Club of Russia's EPC
 

Usually MORE up to date than North American Mercedes Benz's EPC.