Radio that has volume control, six radio presets, a digital console that shows time, station, track number, CD number, etc. Also includes menu, title and radio control. Radio should fit snugly in center of dashboard.
Any kind of radio can go in it, you just have to try hard enough. It doesn't matter whether the radio belongs in the car or not if you really want it. If you are more concerned about the car then you obviously don't need a radio in the first place.