I was looking on car ID and found this. They show it on a new Silverado. It is a universal fit so I wonder if it will work on ours.
https://www.carid.com/body-armor/body-armor-4x4-overland-roof-rack-3813518673.html?parentsubmodel%5B%5D=BED+LENGTH%7C6%27+5%22+%2878.7%22%29+Bed&vehicle=116374