@pyros: 3M Dual-Lock. It's like velcro, but is not plastic hook and cloth loop; it's got
plastic interlocking teeth.
Not to add to the confusion, but regarding wiring harnesses: I used the Metra 70-5519 in my 03 GT (was Mach460 w/ 6 CD changer) and am running H/U-less. It looks like the 3rd harness in ibanez737's post. The back of
my radio looked like this
Big-ups to tmar89 for helping me out with all the initial audio stuff, cause I'm a car stereo retard.