I mean it has been ages since I had the HU wiring out but looking at the pic in the OP, you can eliminate a lot already.
Since you are looking for speaker wires, it's logical to look for a plug that has at least eight wires coming out of it, which counts out the plug on the left of the pic. Then you want to make sure that those eight wires are of the same gauge, which rules out the plug on the right in the foreground, which leaves only the plug in the background. That gives you a visual representation of the colours you need to match up, which you can cross check with the info posted in response and simple deduction leads to positive identification of what is what.
Simple really