I just purchased a 2007 XL7. I was wondering if there are replacement stereos that one can purchase which are compatable with the stereo enclosure on the new XL7. I have noticed several GM vehicles which have the exact same stereo that is in my XL7. Are there stereos which would connect to the steering wheel controls on the the XL7? Where do I find more info on this? Any help is appreciated, thank you.