These printers use the 78C1XM0 cartridge:
Click On a Printer to View it's Cartridges
          Lexmark CS 421
          Lexmark CS 421 DN
          Lexmark CS 521
          Lexmark CS 521 DN
          Lexmark CS 622
          Lexmark CS 622 DE
          Lexmark CX 421
          Lexmark CX 421 ADN
          Lexmark CX 522
          Lexmark CX 522 ADE
          Lexmark CX 622
          Lexmark CX 622 ADE
          Lexmark CX 625
          Lexmark CX 625 ADE
          Lexmark CX 625 ADHE