Is this what you were looking for?
https://airdesignusa.com/sierra-2019-fender-vents-set-of-2.html
I installed their functional fender vents on my 2020 Silverado 1500. It was a bit nerve racking cutting into the fender, but even for a grinder virgin like myself, it came out looking factory. Even the wife couldn't tell I had done anything to the truck when I was done.
If you call in to place the order, ask for Marycruz and tell her Tobie sent you. She's helped me out combining shipping charges for multiple piece orders.