Seal Belt Molding Weatherstrip for F-450/F-550 1999-2015 2016 F81Z-2521453-AA This seal belt molding weatherstrip is designed to fit F-450 and F-550 models from 1999 to 2015, including the 2016 model with F81Z-2521453-AA.It functions as a door trim seal, helping to reduce noise, and entry while improving door closure performance.The molding installs along the vehicle's door frame to provide a secure seal between the door and body.It is constructed to match the shape and dimensions for proper fitment.This part replaces the specified OEM number and serves as a direct-fit component for the indicated models.