James Ward
2015 Tahoe LT
Without the caps, you will get water in and probably short out the led bulbs. You'll also get a lot of moisture in the headlight unit and where we live, that would mean you wouldn't get an inspection sticker.
I installed a set of Supernova LEDs in my 16 Tahoe this week and the caps fit fine. It is difficult getting the air handler out and getting the high beam leds to fit was a chore as you can't see anything and my hands are just too big.
Then I'm glad I switch out the oversized units for these. They fit perfectly and the dust caps fit on fine. Thank you !