For what it's worth, I just replaced the cheesy factory standard non-MP3 playing head unit with a two year old Pioneer unit that I had in my trade using the 99-3304 and the OS2/CM1 combo and everything went together perfectly. Both Onstar and door chimes work just fine.
I do miss the speed adjusting volume though. I’ve been tempted to replace my head unit with one that supports Automatic Sound Levelizer (ASL). Has anyone had any experience with ASL? The only after market head units I know of that support the GMC speed sensitive type is Blaupunkt.
I used a slightly different approach to removing the bezel though. I started by gently pulling at the top where the two vents are and just worked my way down the sides pulling the clips loose. It seems to me that any approach would work as long as you have some place to grip and pull straight out.
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