2007 Liquid Silver SLT2 with 6 disc changer with bose upgrade (no nav sys.). Can the personel audio link cable for ipods be used with this set-up? I asked my local parts dept. and they told me it won't work. Is there something that would keep a GMC accessory from working? It is in the 2008 sales book and the radios for 2007 and 2008 seem to be the same.