Noticed EPC is now $75 a year.

I use the following a lot for other Makes of automobiles.

http://www.partsouq.com

If the site shows as being blocked, try it anyway. It works for me.

Click on the Mercedes-Benz ICON

At the next screen you can scroll around for model. I personally prefer to provide a VIN at the top of the screen - this narrows it down as MB parts at this site will show a multitude of countries if you select just a model like 300-SEL. Use your VIN.

You will in some cases need to look through the various systems thoroughly to find what you are looking for. Example - my '91 300-SEL has the term "transmission" on 2 different lines. You may need to examine both to find what you need.

Not bad for free.