All the G-bodies I ever messed with that steel radio mount plate unscrews and you pull the radio out the front, matter of fact I have a modern style removable face plate style AM/FM/CD that has a steel cage sort of thing it slides into in my 78 and the best way I could figure to install it required cutting and welding to mount it into the factory radio mounting plate, first time I ever did that to install a car stereo!!! It's in the secure and slides right out with the magic keys that come with it!! Good Luck, KillerDave