I have a 2001 4 door Blazer LT.....looking throught the owners manual it describes and shows a picture of the optional rear seat audio controls that can control radio from rear seat, has headphone jacks etc. Has anyone ever seen this set up and can it be retrofitted my truck? Any ideas of where to find used with associated wiring etc? Where does it mount? The console? I already have factory steering wheel radio controls if that matters. I have the factory delco radio with CD player, not the BOSE version