Has anyone installed an aftermarket backup sensor (PDC) on the Countryman?

I purchased one and wanted to see if there was a way to run wires from inside where the brake lights are to near the bumper without drilling.

Also, does anyone know which color wire is for the backup lights on the Countryman?

I got this unit:

http://www.autotoys.com/x/product.php?productid=5

I had the same one for years in my prior vehicle and it worked great.

Are there no retrofit OEM kits?