These printers use the PC-401 cartridge:
Brother Fax 560
Brother Fax 565
Brother Fax 580 MC
Brother Fax 645
Brother Fax 685 MC
Brother Fax 727
Brother Fax 737 MC
Brother IntelliFax 560
Brother IntelliFax 565
Brother IntelliFax 580
Brother IntelliFax 580 MC
Brother MFC 660 MC
Brother MFC 960 MC
Brother PPF 560
Brother PPF 580 MC