So, unless you have returned the new brackets, you have spent $120 for new brackets that you decided not to use. If it allows, you can install star washers, with the new brackets, and use them. Or are the new brackets just not a good fit after all. You stated that all you got was brackets. That is exactly what the ad says at fcklightbars says.
You posted here, as a new member, only on the off chance that one of the members here had already done the leg work for not a single bar of lights behind the 03 1500HD grille but 2 rows of lights. That is a very specific want and I do get your frustration. What is happening is you are getting more and more frustrated because whoever tries to help and not give you a very specific answer, is of no use to you. When I was in the auto repairs shops for 40+ years, I met people like that. A better set of pics, showing the exact problem you are having with the existing or new brackets may help a problem solver member come up with a response/answer. In other words, take a deep breath and help us to help you.
Dismissing people's attempts to help will get you no where. As a 72 year old Vietnam Vet, I have seen a lot in my shops and in my driveway but never your specific question. Sometimes it takes input from a group to solve one specific problem. What I am saying is, cool your jets and mellow the effffff out. Post pics of the specific mechanical problem and use your noggin to figure it out. Maybe some spacers to make either existing set of brackets work.