These printers use the C8061X cartridge:
Click On a Printer to View it's Cartridges
          HP LaserJet 4100
          HP LaserJet 4100 D TN
          HP LaserJet 4100 MFP
          HP LaserJet 4100 N
          HP LaserJet 4100 Series
          HP LaserJet 4100 TN
          HP LaserJet 4101 MFP
          TROY-Systems Troy 4100
          TROY-Systems Troy 4100 EX