The Black plastic inner fender liners are just the bottom section that goes up about a foot and a half on the front and rear of the wheel well opening, on both the front and back wheel wells. The center area is open to the metal underside of the wheel well. this configuration will lead to mud getting trapped between the liner and the wheel well creating a haven for rust to form. I have seen this on all the 22's 1500,2500,3500. My 2020 has a full liner that goes from bottom across the complete inside to the front side of the wheel well thus closing off the metal section of the trucks wheel housing.