Disco 2 Cable access for reversing sensors

Hi all
I'm fitting a Valeo parking sensor to my TD5. Got the bumper off and marked out where to drill the 4 holes for the little eyes, next step is to get the cables into the car.
I need to find an aperture to put the reverse sensor cable from near the back of the bumper into the bodywork around the rear light cluster. Is there an existing hole I can utilise?

The Land Rover wiring for the tow bar, is routed up the rear offside.
There is a plug for it just below the rear light cluster on the offiside body.
Its accessed by removing the light cluster and there is a channel from below the bumper up to the light.
I presume the nearside will be the same.

Thanks Bigeeeee, I'll have a look in the morning.

From RAVE

Just been out to have a look and it looks easy to connect a live and earth for the reversing light, just need to find a 12v feed beyond the grommet.

All done today, thanks for the pointers Bigeee