HP Q6651-60341 carriage stopper is a replacement part for the carriage assembly in supported HP DesignJet printers. It is identified by its exact HP part number in the service manual, making the reference clear when sourcing this component for printer service.
The part includes the carriage stopper screw and media-axis motor bracket. The manual lists it for all printer sizes and points to page 323 for removal and installation instructions. This listing describes the stopper assembly and its specified included components; it does not establish compatibility with any particular printer model.