I spent too much time trying to figure out which plug this was, but i may be possible to find the plug on ebay ( if u want to spend 9-10 bucks for it plus shipping, i tried and got the wrong cable thought it was a vivo but was a cheap one from china that was not mini din but a more standard size). The plug is same as a VIVO plug for a nvidia or geforce video card i believe. You should be able to find the mini din pinout and standardized plugs and non-standard types. All in all what i ended up doing was using a db9 that is the standard of alot of computers (serial cable and serial port). This also made the cable easier to obtain. I found this to be much better because it provided a way to secure the connection to the box without moving ( which would cause shorting). I had to relocate the plug and create a hole in the metal access cover.
Now i have a problem with both sets of speakers buzzing so im thinking either 1) the cable is shorted, 2) mosfet is bad, or 3) soldier shorted somewhere. All in all it's been a real pain in the a$$but ive learned alot.