These printers use the 841921 cartridge:
Click On a Printer to View it's Cartridges
          Ricoh Aficio MP C-2004
          Ricoh Aficio MP C-2504
          Ricoh MP C-2003
          Ricoh MP C-2003 SP
          Ricoh MP C-2004
          Ricoh MP C-2004 EX
          Ricoh MP C-2011
          Ricoh MP C-2503
          Ricoh MP C-2503 SP
          Ricoh MP C-2504
          Ricoh MP C-2504 EX