I have these mounted on my dually: https://www.carid.com/rek-gen/rek-gen-merica-dually-mud-flaps-1051865858.html?vehicle=164017?utm_source=email&utm_medium=order&utm_campaign=order_tracking_number
I've only mounted the back ones so far though. Used existing holes in the fender and put over the top of the factory flaps. Clips and bolts from RekGen. I just needed to cut holes in the flap to match up the holes one the truck. The back ones look good and work well. I just haven't done the front yet.