QualGear Pro-Av Projector Mounting Bracket for 1.5-in NPT Threaded Pipes, Black [Ceiling Adapter and 1.5-in NPT Pipe are Not Included] in the Projector Mounts department at Lowes.com
Amazon.com: Mount-It! Wall or Ceiling Projector Mount with Universal LCD/DLP Mounting for Epson, Optoma, Benq, ViewSonic Projectors, 44lb Load Capacity, Black : Electronics
InFocus PRJ-EXTARM-02 Mounting Extension for Projector – Black – Dihuni