These printers use the CF031A cartridge:
Click On a Printer to View it's Cartridges
          HP Color LaserJet CM-4540
          HP Color LaserJet CM-4540 F
          HP Color LaserJet CM-4540 FSKM
          HP Color LaserJet Enterprise CM4540 Multi
          HP Color LaserJet Enterprise CM4540F Multi
          HP Color LaserJet Enterprise CM4540FSKM Multi