Thread: Swinging Arm for a 7" Lilliput?

Was sent to these forums, told you are the experts.

I was wondering if anyone knew where to get a swinging arm to put a 7" LCD on. I am building my first Carputer and want the arm so the LCD can be switched from the Driver. to control music and use gps, over to the Passenger to watch movies and play games.
Do Police use anything like this for their screens?
Is it possible to have the arm extend so the monitor could go to the back seat?

Thanks all!