Hello, I just purchased an 06 Trailblazer LS 4x4, I kept my system from car I traded it for. I have a Pioneer Avic-Z3 w/Bluetooth, HD Radio, XM Radio, and Rear View Camera, and Polk Momo Carbon Series 6.5" components, Polk Momo Carbon Series 6x9's, and Polk Momo Carbon Series 4 channel amp. Anyways, how do I replace the front and rear speakers ? (I know the 6x9 won't fit, I'm goin to find another set of 6.5's)