There are a number of vehicles that get missed by the aftermarket as cars/trucks/vans that can take a double din. For example the Toyota Sienna. They only sell a bezel kit that accepts a single din with a little tray. Well the Sienna accepts a double din no-problem. We got toyota's bezel part for thier factory nav unit and a few brackets and it works.
Sometimes you have to just take the car to an installer and have him check it out or find a forum for your own vehicle.