Insert Seat Fillers Pro through the seatbelt catch using the rectangular slot in the back of the fillers. Pinch back the seat, push them all the way down, and tuck 'em in nicely. If you are a BMW-lover or otherwise have straight/parallel seat gap - skip the "pinch seat" step. P.S. Make sure that the P-shaped filler's flat side is facing the center console, and the curvy side is facing the seat.