By the wire colors you indicated, you must have a Standard or Tourer. The wire functions are as follows:
Brown - Running Lights
Green - Ground
Green/Yellow (yeah...it is supposed to be yellow...not white) - Brake Lights
Your other wires in the plastic sleeve:
Light Blue - Right Turn Signal
Orange - Left Turn Signal.
The referenced website will show you the wiring schematic...
http://www.rattlebars.com/valkfaq/schematics/rpage03.htmlSo, if you slice your module into the Green/Yellow wire, your back-off module will work properly. It doesn't matter where you splice it in. i would probably do it at the right side cover for easier storage of the module (under the seat or side cover).
Good luck with your safety modification.
Joe