These printers use the PFI-207M cartridge:
Click On a Printer to View it's Cartridges
Canon imagePROGRAF iPF 680
Canon imagePROGRAF iPF 685
Canon imagePROGRAF iPF 780
Canon imagePROGRAF iPF 780 MFP M40
Canon imagePROGRAF iPF 785
Canon imagePROGRAF iPF 785 MFP M40