Just finished getting a speaker for dash of 69 W111 cab and restoration of Europa TR with ipod connection. Sources
speaker
http://www.koenigs-klassik-radios.de/loudspeaker/special-loudspeaker-for-mercedes-benz-111/a-31122/
Quick delivery and exact match except had to trim the four pieces to elevate the speaker. On the old speaker they were attached.
Radio
http://www.beckerautosound.com/
They also have the speakers but I didn't know about them before getting it from Koenig