Yeti - installing Rear Camera to Columbus

Hi all,

 Needed some advice on how to install a reversing camera to my Yeti, the main issue I have is how to access the reverse light as shown in the pics - I cant see how to remove all that black cowling inside the rear door or whether id need to.

If anyone has any advice on:

 Which camera to get for this model (will be connected to a Columbus unit)

 How to get access and install the camera

 Which route to take running the cables back up to the headunit

Many thanks!