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http://www.amazon.com/gp/product/B007WZS41I?psc=1&redirect=true&ref_=oh_aui_detailpage_o00_s00 i bought these, they work very well... kids love them....

gm11 is the right kit, just look on the box and it will have spots to plug into the harness on one of them it says with factory amp and the other without amp, just plug and play.... all you have to do is hire the new head unit to the right set of wires and everything is plug and play, pretty...