I recently bought a 1996 corsa which already had a cd player in it. I wish to now change the cd player as it is rubbish. I have disovered though that the head unit is of the old wiring type. the car once had an ISO, but the wires have been cut from it when the current head unit was fitted. What is the simplest, cheapest and easiest way to fix the ISO, in order to install a head unit of the new wiring type? please help!!!