These printers use the 12B0090 cartridge:
Click On a Printer to View it's Cartridges
          Lexmark Optra W-820
          Lexmark Optra W-820 DN
          Lexmark Optra W-820 N
          Lexmark W 820
          Lexmark W 820 DN
          Lexmark W 820 E MFP
          Lexmark W 820 N
          Lexmark X 820 E
          Lexmark X 820 E MFP
          Burroughs-Unisys UDS 45 W
          Riso-Corporation M 820
          Riso-Corporation P 820