I bought 2 of these monitors for my son they were cheap $26.44 for both.
http://www.ebay.com/itm/LCD-Car-Reverse ... 3394822c7fThey look good and clean picture but a little small. I just pulled my headrest out and cut a square out in the center of the headrest (much smaller then the lcd). Unscrew all 4 screws from the back of the lcd . Turn the headrest inside out. Place a book inside the headrest ,this will help keep it straight. Separate the lcd, there are a few wires keeping it connected just keep the 2 pieces close together,and slide it in the cut out lcd facing down. Then line up the front and backplate( keep your book straight and lcd) and screw it back together, screwing throught the fabric and into the lcd front trim ring. Reverse the headrest and gently pull it over the foam.