Thanks for the info. If john is contemplating the brackets, could you (or john) PM me with info on obtaining one? I may have to adapt it to the Motorola bracket but I'll be further ahead. Thanks.
That cable should work fine, doesn't your head unit support Bluetooth? If so id just connect it that way and save the cost of the cable.
The only reason you need the USASpec adapter is with the stock radio. The Belkin only adds Bluetooth which I believe the "BT" in the name of your stereo stands for.
It depends really, I'm sure wiring it gives it truer sound but connecting mine over Bluetooth seems to give deeper bass and crisper highs.
I use the side buttons for volume on it. The volume options for the different apps are all over the place, but the buttons stay the same. When it's connected to the stereo (Bluetooth) the stereo handles the volume (buttons don't seem to have any effect.