and what size...

i have a 4th gen..i dont knwo what size will fit and what lookz the best>?

 

i wouldnt go with the cheapest tv make sure they are angle vision meaning u can view it at an angle. i put a cheap one in my steering wheel and only the driver can see it. mobile vision is a good brand cuz it has buttons on the side of the screen to turn it on and off. u can use 5.6 or 6.8 in the headrest.