I liked the looks and function of these Mopar rubber mudflaps when I viewed chet's photos at the top of page 12, so I ordered a set for my 2021 2500. I installed them with factory smooth fender flares. Three notes about the installation:
1. The kit comes with black-oxide coated fender washers for the front flaps (you can see them under the factory screws and the POM rivets in Chet's photos above). These are carbon steel washers, and they started rusting within a few weeks of installation. So I removed them (had to cut off the POM rivets), and replaced them with black-oxide coated stainless fender washers (McMaster-Carr 90377A147).
2. Since I had used all of the POM rivets that came with the flaps from Mopar, I tried using some of the POM rivets in the Harbor Freight installation tool kit (Pittsburgh 97757). Ugh. Half the time they wouldn't expand and seat on the backside of the hole before the plastic shaft broke off. The rivet tool works fine, but the rivets are less than impressive. So I substituted McMaster-Carr 90219A340, which came labeled as replacements for the OEM FCA, Ford, GM, etc. part numbers. These worked as intended.
3. The upper attachment point on the front flaps requires a hole to be drilled through the fender flare for a factory screw with captive washer, and through the lip of the steel fender. I was unwilling to drill through the fender, so I moved the hole outboard, through the fender flare only, and substituted a POM rivet for the specified screw. So far, so good. If you make this change, be sure to locate the hole to leave room for the POM rivet to expand in the cavity inside the flare.