I have a 2021 Standard cab and on both sides there is a black plastic piece attached to the cab that matches the door trim I can't seem to be able to find the part number. A strange issue. When it's cold a blister appears on the passenger side piece. But when the sun hits it and heats the black plastic it goes away. Figured if the piece was reasonable cost I would replace it on my own instead of trying to get it fixed under warranty