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I put an overhead dvd in my car that has a sunroof (Alpine 10.2"). With my truck, I installed dvd's in the headrests (Vizualogic 7" with dual dvd players). I like the headrest option better because the overhead unit in my car blocks the view out the rear view mirror. If I were to do an overhead dvd again I would install two, one on each side so I can see out the back.