E34 factory radio

[6670charger]

I will be buying a 92 525i Wagon in a few days. This is a European spec car. The car has no radio in it right now, but, I found and purchased a factory radio and its wiring harness plugs from a junked similar vintage 7 series car. I assume most of these radios interchanged in some fashion, and that all I have to do to hook it up is splice the matching wire colors in the dash to the plugs for the radio.

My question is, how does the radio ground? Does the threaded stud in the middle of the radio (rear view) ground to the body? There doesn't seem to be a specific ground wire, unless the Germans use a color other than black to designate ground.

I've attached a few pics of the radio front and back to help show what I mean.

Any suggestions would be helpful.

Thanks.

[Moose]

The screw you are referring to, usually has a threaded "rubber piece" for lack of a better visual. The radio is already grounded through the wiring. Yes the Germans use a different color system to the wire coding than we do in the states.
Live (L): Brown or black, (but black is not very common, I never see it)
Neutral (N): Blue
Earth (G): or common ground is Yellow and Green striped
I am a Biomedical Technician and specialize in German Dialysis machines. The color coding is the same on even the medical equipment...
I hope this helps

[6670charger]

Yes it does!! Thanks.