If you want to install a single DIN, pop out monitor but dont want to block your heater controls this piece is available. Installed one in a customers Regal a couple years back, pretty nice piece I thought.
Heres the link: http://www.thedetailss.com/G-Body_Install_Kit.html
Heres the link: http://www.thedetailss.com/G-Body_Install_Kit.html