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Most any basic 1 DIN head unit will fit. My CDA 7998 has a barrage of RCA wires and an external DC-DC converter/filter and it fit with all that mumbo jumbo behind it.
It varies, the room behind it becomes less the closer to the top.
You mostly run in to trouble with the head units that have the rca jacks onboard. With nice headunits like the 7998, or pioneer 7800, they have a bundled cable that hangs down with the RCA plugs, and this fits much better.