[hahakenny]

If you already have an aftermarket receiver installed and want to install a different aftermarket receiver, you should already have what you need. Just remove the Alpine and you should see that you have an aftermarket harness hooked into it. Just cut the wires that lead from the harness to the Alpine and use that. Follow the instructions that should be supplied in your new Unit. You will need to splice the wires from the old aftermarket harness to the harness that is supplied in your new Unit. The rest of the wires shown in the pictures you attached are for your aftermarket amplifier.

Good luck.