hey guys recently baught a double din head unit from a friend its a jvc aw-avx840 head unit. i have sub and a amp that is already in with the stock head unit using a Line Out Converter. so the main question i have is what is the wiring harness that is used for the adapter for a aftermarket head unit that ties into the stock wiring behind the head unit. i would rather not use the same line out converter set up. i wunna re do the install of the subs and get everything finally looking professional. if anyone has any ideas or the parts that i need that would be great.