E30 Zone

Hello, Just wondering if anyone can help. I want to fit an aftermarket stereo, but behind the blank space of where a stereo should be, I cant see anything to connect it too! can anyone provide pictures or a good explanation please?

The power ( permanent live, switched live, panel lights and earth) come from a four pin section of the accessories socket behind the glovebox. The speaker wires are twisted pairs of wires in various colours, and the aerial feed is black coaxial.
A radio was not a standard fitment on an E30, so, if yours has never had one, none of this may be present, except for the empty section on the accessories socket.

Can you do something about the size of your avatar, please. It's taking up half of the page!