The red one would work great for the rear foglight.
I was thinking about picking up a red set for the fogs/ 5th brake light but the white ones come through really red through the red plastic on the Golf. If you had Jetta GLI tails that have the clear for the fog I would think you'd have to have a red one. It would out power the running lights though would be my guess, they are not very bright.
So I got my dash cam (front and rear cameras) hooked up yesterday.
It's a really nice feature to have, I'm still figuring out the ins and outs of the settings and what I need to do to make it *mostly* hands off.
Our cigarette lighter down in the mid console is on constant power which is pretty rare for an older vehicle. This is nice in the sense that parking mode still works because you have power to the camera, but as well there is no auto shutoff with the key. There's settings to make it auto shut down when its idle for X minutes, but you have to ensure to stop the recording on the screen for it to start the time. Not a big deal.
I also made a pigtail that connects to the back of the bulb holder and plugs into the revers bulb "tang" that runs up to the trigger wire on the harness. As soon as I kick it in reverse it pops up on the screen and uses the rear camera as a backup camera. Although because of the design, in order to "record" in normal orientation, when it kicks the image to the screen, it's mirrored. That takes some getting used to. Because of how it's mounted though it really only does any good to see how close you are to objects behind you. But that's really all I use it for anyway, my mirrors get me everywhere else.
I ordered a camera that takes the place of one of your license plate lights, but I'm not sure yet if it's going to be compatible with the dash cam unit yet or not. I've been talking with tech support but the language barrier is really difficult when trying to talk tech, get pinout diagrams, etc.