DIN refers to a standardized radio/stereo size for vehicles (large enough to accept a CD). The size is 2" high by 7" wide. 2 DIN or double DIN refers to units that are twice as high as the standard DIN, and so 1 DIN would be the standard DIN specification.

Buy 2.. send one to me.. then I can help with the install !

http://www.ebay.com/itm/Clarion-NZ503-DVD-Multimedia-Receiver-with-Built-In-Navigation-and-Single-DIN-Mo-/261186420780?pt=US_Video_In_Dash_Units_w_GPS&hash=item3ccfec802c