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You need this.... Amazon.com: Metra GMOS-044 GM Factory Integration Interface Adapter for 2010-up Select GM Vehicles: Car ElectronicsI have pulled the trigger and purchased a Pioneer model # AVH-X4500BT also I have purchased a Scosche dash kit for fitting the head unit for a clean look. Is there a wire harness I can buy so I don't have to splice wires? I want to be able to reinstall factory headunit when I get rid of the car. Please I could use some help on the situation. THANKS.