All double DIN head units are the same size, and even if a specified double DIN head unit is technically smaller than its mounting location, it will always include a frame or bezel to fill in the remaining space. Nearly all of these products take advantage of their size—four inches tall (and seven inches wide)—to allow for screen-based control panels and connecting at least one camera for increased safety and environmental visibility. But you need to make sure before purchasing a double DIN head unit that your car isn’t restricted to a single DIN head unit.