I am looking to buy a touchscreen LCD for my project but wasn't sure about the size. As I understand the screen is measured diagonally so a 7" screen would be just that. It does not however include the plastic surround panel which in often cases can add another inch to the overall size of the panel. I have an 8" opening in the dash, is there a screen that would fit into such opening? When I was looking at the items in the store, they don't list overall dimensions of the panels.