The stock radio is still in. I was hoping to use the wiring
from the stock radio and just plug the 'new' Becker into the
existing wiring. No idea if this works but. Not an exprt on radio
installation, hence I am reluctant to pull everything out.

The cable came with the radio and maybe do not fit a MB.
Becker radios are quite popular in Germany (I got it of the german e-Bay site) and not unique to MB cars. So the cables
might belong to some other car make.

Willing to learn if I get some pointers.

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1989 300CE (aka Schatzi)
2002 Ford Explorer