Ric,
I'm not sure what you are asking. The OnStar unit is an assembly that can be removed.
Disconnect the battery, slide the console back, remove the dash panel, and the whole OnStar unit comes out with a couple of screws. Unplug the wiring connectors and GPS antenna.
Beware that the "pocket" is kind of shallow. There is a plastic brace in the back that supports the rear of the OnStar assembly. I had to cut this brace out to install my GM CD Changer.
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