These printers use the KX-FA76 cartridge:
Click On a Printer to View it's Cartridges
          Panasonic KX-FL 501
          Panasonic KX-FL 502
          Panasonic KX-FL 503 CN
          Panasonic KX-FL 521
          Panasonic KX-FLB 750
          Panasonic KX-FLB 751
          Panasonic KX-FLB 756
          Panasonic KX-FLM 551
          Panasonic KX-FLM 751
          Panasonic KX FLB 753
          Panasonic KX FLB 755
          Panasonic KX FLB 758
          Panasonic KX FLM 753
          Panasonic KX FLM 755
          Panasonic Multifunction Fax KX-FL 501
          Panasonic Multifunction Fax KX-FL 521
          Panasonic Multifunction Fax KX-FLB 751
          Panasonic Multifunction Fax KX-FLM 551