I have a 2004 GMC Sierra (Extended Cab, WITH Bose system AND OnStar) into which I'm installing an aftermarket stereo. I have no intent to use the factory speaker wires or the Bose system (I am, in fact, ripping out the Bose amp and so-called sub to make place for a 10" stealth sub). I am not sure which harness to buy or what the correct wiring should be, as I basically need a harness exclusively for the purposes of maintaining chimes and OnStar. Which harness is the correct one? GMOS-04 (for Bose, despite me ripping the Bose system out) ... and if so, how should it be wired in given that I won't be using the vehicle's speaker wiring, at all? GMOS-01 (for non-Bose) .... and if so, is a SP-2003 speaker needed for OnStar/Chimes? Also, if the SP-2003 speaker is needed does anyone have suggestions on where to place the 3" X 2.5" X 2.125" SP-2003 speaker? Behind the HU, within the center console, and in the kick panels are all right out, as I already have things going into those locations.