I had tried to use pre-cut tint film and the shape of the 2018+ tail lights made this task almost impossible. I had already destroyed 2 pieces of tint film and had bought a second set. In the end I lost patience with the tint film. I then found these clip on covers and can't rave about them enough. They're so easy to fit and (in my opinion) look great. Don't waste your time and money with tint film for the tail lights, Use these clip on covers instead.
Great item. Really enhances the blacked out look I wanted.