These printers use the 491-0312 cartridge:
Click On a Printer to View it's Cartridges
          Lanier 2001
          Lanier 2002
          Sharp FO 550
          Sharp FO 4650
          Sharp FO 4700
          Sharp FO 4970
          Sharp FO 5550
          Sharp FO 5700
          Sharp FO 5800
          Sharp FO 6700