Not sure of the size, but I do know you will need a 4in tall opening for a Double Din radio no more no less. The easiest way to mount a double din radio is with the supplied sleeve if it comes with it. We sell at lot of SmartNav harness for the Pete this will probably be the same
Again about the screen most of our customers leave it unhooked or try to find a Truckers Nav that would fit well.
James