the earlier versions had the split loom to power the head unit and the cd player so no extra wires needed and then one lead that connected the cd player to the head unit and then that went onto the amp which had a separate power supply and then the speakers were the same plug as before, you have the later one which needs specific wires for each, which i don't have

they were also colour coded so you knew that you would need a yellow or blue or red plug on the end for each specific application, whereas the one you've got now needs a different plug for each application, the same plug but with different mouldings on the end so you can't just swap the wires and plug them in

what you need to do is find an at least 93 spec granada or a scorpio in the scrapyard and all the wires will be in there and on a separate individual sub looms so you can remove them all in one go