OK, so im trying to install a new sony HU, and we bought the wiring harness that said it would work from walmart. well it doesnt, i then went to Best Buy and they gave me another harness that doesn work, what the hell harness works? i have a 2000 mustang that has both the cd player and the casette player, anybody knows what gives? i know ford made about 5 million different harnesses what do i need?