I agree that blocking the vents off is a bad idea. They draw a vacumn to the interior to draw out fumes and all, and are connected to a drain hose to release water that comes in the vent. I am not an expert on the matter... but if the LED assemly is 2 1/2" long and goes into a 4" wide slot, wouldn't it leave enough room for the vent to do its job? What if only a couple of the vents were partly obstucted by the LED assembly? Any experts out there with some math formula to figure this out? It would be nice to see some numbers for partial obstuction to the middle 2 vents, then the middle 4, and then partial obstruction to all 6 vents. These assemblies shouldn't have to completely restrict the air flow, the big question is "How much will they restrict it and how much will it affect the function of those vents to vent the interior?" Hey... I want these LED assemblies to make things safer, not to asphyxiate myself!!... Whoa, that's brutal! Anybodies $.02 worth is appreciated here... BTW, GGT, these LEDs are 2 1/2" long, put 2 of the red assemblies in the middle, seperated by the metal between the vents and there you go, a 4"-6" wide center brake light. They can be daisy chained together to whatever legth you want. I see this as an oppurtunity for me, or anybody else, to get some prefabricated LED assemblies just like you see in the schematic above, for 3rd brake lights and for whatever else I may find a use for them