I wish I was not so late to this thread. I recently acquired a used dash cluster with good idiot lights, so I took a bunch of pictures to share. These plastic discs look to be glued to the rubber backing. The hi beam is actually a different, darker red than the oil and generator lights. If you look closely at the pics you can see that the light doesn't shine through as much as the other 3 so I assume you wouldn't be distracted if you were using your 4 headlights while driving in fog other weather conditions. I would purchase at least 4 sets of these, but would love to help in recreation in any way I can.