Mega, what you need to do is look at it. Much like the head lamp adjustment holes, they are there for you to see. When you walk to your Hummer, look at the back of the DRL, all your questions are answered instantly. Sounds like you have not even look at the back of your DRL, certainly never the front of your head lamps. We all learn from each others. I read about the head lamp adjustment from other members here months ago. Welcome.
Go to your Hummer and take a look.
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