I just stumbled across this fleabay listing
http://cgi.ebay.com/ebaymotors/Becker-Europa-II-Stereo-Mercedes-240D-300D-450SL_W0QQcmdZView
Bidding is up to $165.00 among three guys. I switched out my Becker for a CD player last year only to have it stolen a few months after the install. Now I'm listening to the Becker again, but I have to make sure I don't park near any vintage MB enthusiasts.
Otto
'79 240D