2001 Silverado - Dome / Headliner Computer?

[Murphster05]

Hello,

I have a 2001 Silverado and it has the full dome / headliner stock storage system (garage door, glasses, etc). At the front where the lights are, there is a plastic inlay for another piece (seen other trucks of this era have their MPG calculator, etc. here). What would this piece be called? I had an aftermarket XM radio there and will likely be removing it, hoping to put something in its place... any thoughts?