Went to Audio Tunes today. Looks like the bracket they used is a custom job. Made by some plastic, heat shrink and some ingenuity. Spoke with the manager there. They would be willing to make more of the brackets used for my XM Commander. He described the installation as this; the lower part of the bracket, which is about as wide as the XM Commander is wedged (the console is lifted, and then this bracket is placed in between the console and center vents).

If there is interest in having these made, let me know, I will ask them to make one and I'll take pictures of it. He said they could make and sell them for $20. That and shipping and I could send them to you.