OK back OT. Today I installed a rear fog using the left rear reflector. It was easier than I originally thought. Here are the steps:
1. First I bought a spare left reflector, just in case, and a meter of weatherproof, flexible, red strip LED lighting from SuperBrightLEDs. This strip can be cut into 3" lengths.
2. Cut a hole in the back of the reflector at the bottom, full width and about 1/2 an inch high
3. Carefully slide the LED strip into the reflector between the back and the red lens. Cut the strip where it comes out of the lens, at the nearest marked cut place.
4. Repeat step three until 4 strips are inside the lens. Use a piece of coat hanger wire to insure the strips arestraight
5. Solder wires onto each strip. Solder all the positive wires together, same with negative wires. Attach a connector to each
6. Remove stock reflector from car. Cut a narrow rectangular hole in the bottom of the recess to accommodate the wiring
7. Snap the modified reflector into place, fitting the wires into the hole.
8. Connect the wires. Since I have an external rear fog, I just temporarily tapped those wires. Both fogs come on at once now. I will remove the external fog once I see the new fog at night.
Note that I cut the holes in the bottom so that the lens wouldn't fill with water. Also, I used liquid electrical tape and shrink connectors for further water proofing. Some silicon caulking might help too.
That's it. Easy and works great.