What model did you get for your high beams?
I screwed up and bought the H11 low beam / 9005 high beam kit which is wrong! Changed from the 2019 Silverado 2500HD. I could not find the bulb size/model in the owner's manual, but just saw an Amazon review that said the 2020 2500HD high beam is a H9. But from what I'm seeing advertised the H11/H9/H8 are all the same and are for low beams... ? I guess one product description does say the H11/H9/H8 can be used for either high/low/fog as long as the bulb type matches. I might try the H11 bulbs I was going to send back for high beams.
I installed the 60W LED H11 for the high beam and they aren't really any brighter, just have a wide pattern as the high beam.
Edit: Actually the Amazon vehicle fit helper and a seller both say the 9005 will fit the high beams, but it does not.
Edit again, because I don't even remember that it was posted earlier that the high beams are H9.