you need the following because you don't have the split loom as found in some cars

the early ones were different to the ones that came in the middle to the one you have

you need a loom to power the head unit which is standard, but then you need a different loom to power the amp and the cd player and a different loom to collect the cd player to the head unit and a different lead to connect the head unit to the amp and a different lead to connect the amp to the spakers