I moved my Weathertech from mats from my 2014 3500 to my new 2019 3500. They fit, but only “kinda sorta”. The first clue that something is wrong is the openings in the mat to secure them to the floor. The previous gen mats had an enongated hook, whereas the new mats have a round button opening. The new ones will secure to the round floor button points in the floor, but I had to push, bend, coax and finally help things along with a screwdriver point. Hanging a St. Christo cross over top of the installation event may have helped, but I didn’t have one handy. The fit of the mat against the door opening seems a bit different as well.