ok, so took it apart again and got some more snaps.
so as you can see the old head unit has a bolt for the earth to slide into and the new head unit doesn't. do i need it?
old head deck
new head deck
and here's what the clarion cable goes back into
and just to clear up, the black plug is power and the grey is for the dash controls? i thought it was the other way round in the diy, but the black was the one plugged into the head deck and the grey one was just loose.
and lastly, what the hell is this for?? it was just loose.
thanks guys, much appreciated!