These printers use the UG-5510 cartridge:
Click On a Printer to View it's Cartridges
          Panasonic DX 800
          Panasonic PanaFax DX-800
          Panasonic PanaFax UF-780
          Panasonic PanaFax UF-790
          Panasonic PanaFax UF-6000
          Panasonic UF 790
          Panasonic UF 800
          Panasonic UF 6000