I have bought the CD for W124 model some years ago part number is P-2700-124-099 version 2.0, but check with MB dealer if it is still available and if it suits your request.

Seems to be available, it is still in the list of CD/DVD on the purchase online, see 16th ITEM on this link.
http://www.startekinfo.com/StarTek/outside/9124/?requestedDocId=9124

Good luck

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Keep us posted especially if your problem is solved
Present cars:
My car: E-class 420CDI, 2008, W211, V8, 180 000km

Wife's one: C-class 220CDI Sport Coupé, Euro, 2002, W203. 345 000km

Son's one: GLK class, 220CDI, 2009, W204

Sold: E-class 260E, 1988, W124, Wonderfull car sold after 489 000 kilometres of reliable services (engine M103, clutch, brake system and 5 speed manual gear box all original).

Sold: E-class, 320CDI, W210, 2000, 225 000km