I forget which ones Pitstain has, didn't exactly like the color, but true fog lights should be yellow, and driving lights should be white. Can remember when I had a TR4A and was actively rallying in my youth LOL. I had Lucas Flamethrowers one with a fog lens (fluted/amber bulb), and one clear lens and that was the driving light. Had separate switches for both.
Anyway, don't know if it was pitstain who has a brake duct leading to the fog light well with a smaller and much more powerful light suspended within the opening so as to allow air to go around the outside space.