Class of 2016 here, they were on the truck when I bought it and it makes it look much better, my 2019 did not have the painted ones and I like the look of the painted ones more. Blends in well with the black.
Also, I work at a GMC dealer and the GM hard folding bed cover that are made for these CarbonPro beds have been quarantined in China, with no ETA available, so if anyone is having trouble getting one, that is why.
The Retrax came off of my 2019 AT4 so it was already “put together” when I put it on the CarbonPro bed. All I had to do was drill 4 holes in the locations that the clamps go with a 1.5” hole saw. Clamped it down and had no issues with it. Pollen is already taking over here in east Texas.
I successfully installed a Retrax bed cover on my CarbonPro bed this weekend by using the hole saw method. A lot easier than I thought it was going to be. Did not run into any hiccups.