These printers use the KX-FA76 cartridge:

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