These printers use the 18C0781 cartridge:
Click On a Printer to View it's Cartridges
          Lexmark X 735
          Lexmark X 2300
          Lexmark X 2310
          Lexmark X 2330
          Lexmark X 2350
          Lexmark X 2350 AIO
          Lexmark X 2350 All In One
          Lexmark X 2450
          Lexmark X 2470
          Lexmark X 3370
          Lexmark X 3450
          Lexmark X 3470
          Lexmark Z 730
          Lexmark Z 735