I have a 2007 Lbz and somebody has given me a aftermarket cd player. My truck is plain jane tho it doesnt have onstar, bose, or steering wheel controls. I went to best buy and they tried to sell me a wiring harness that cost $100 but it says its for onstar/bose and everything else. Im just trying to figure out if I need that one or is the a better priced one that I could use? Any suggestions will be appreciated...