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Originally Posted by BuzzH3

I'm not sure of the dimensions of your XM box, but I have the XM NavTraffic one and I can't believe it would be any smaller. If you just slightly bend the metal bracket holding the onstar box, the XM box will slide all the way down in there so it actually sits lower than the onstar box. There is no interference at all with the HVAC controls.

Yeah, I want to move my camera there too. I just have to get around to doing it.

Cool. I'll let you know how I have to adapt the bracket for the camera to fit in that location, if it is the final location I choose.
Also did some research on the GPS antenna mounting under the dash. GM installs their NAV GPS antenna, just to the left of the upper heater/ac vents, behind the I/P cluster, immediately under the plastic dash panel. I believe, if the cluster is removed, access to that area is easy (not sure at this time). Cluster removed in about two minutes.
I plan on trying to mount the antenna there, if not, on top of the heater vents as close to the top as I can get it.
This should work for GPS, but would never work for XM or probably Serius due to the locations of the Satellites.