Thanks to DavidB8, both Zee007 and I now make two (2) 2010 S5 owners with working rear fog lights on our cars. As you know, it did not come this way from the factory and so I had to order the H/L Switch (Euro part 8K0 941 531 AL WEP) from Alex with Europrice and then rely on David to be available to program the rear fog lights. It was fairly quick and it came out quite nicely. I was also able to see what it would be like to use the inner LEDs as fog lights but I didn't quite like that look. The first photo is the rear fog activated, the second photo is with the turn signals/hazards, and the third photo is just the running lights. Take note that by using the Inner outside assembly light as a fog light, it does not illuminate at any other time. Thanks again to David, Alex, and Auditech91320 (who helped install the switch) for making this possible and activating what should have come on the car originally.