Cheapo reversing camera

[cglittle]

I've got a 2016 Berlingo van, L1 with the 7" touchscreen radio. 

I have bought a cheap reversing camera from Ebay hoping I can utilise the screen. Cheap, means from China, and there's no instructions at all)
The camera kit comes with a power socket (presumably powered from reversing light) and a regular RCA video cable which happens to be JUST the right length to be fed from the rear door, under the liner, tucked under the passenger door seal and behind the glove box and reach the back of the radio.
Does anyone have a diagram of the all the ports on the back of the radio? The ISO plug is obviously the power and speakers, but there are a number of other cables. One of them simply runs from the back of the radio down to the bottom half of the screen. Another I assume is the aerial, one being the steering column controls. Another for the USB media port?
There is one unused port, coloured grey which MAY be an input for the camera(?)

I've also bought a pair of LED spotlights for the front... Looking for a suitable place to fix them. Theres a square part of the plastic bumper, but I was looking for something more solid. I don't want the lights bouncing around when I'm driving.