Don't expect it to be much different to the V6 of the same model. On the V6, the reversing light switch was above the oil level (check switch position to the height of the oil fill plug?). Just un-bolt & replace. I was surprised to find the local auto factors stocked it !
To check your switch, just us a continuity tester. In reverse gear it should be short circuit.
Good luck
Andy, March 2009