What size of HeadUnit can Metra Kit fit?? 6.5" or 7"

 

I believe it is 7....but It will fit double din...which is a standard size. So just make sure the headunit is specifically a "double Din". I have a 5" screen, but thats because the buttons take u the rest of the space. I believe there is a pioneer headunit 4200? that is a full 7", and there are no buttons...just a giant touch screen. I have the Pioneer 3200BT.