These printers use the W2123X cartridge:
Click On a Printer to View it's Cartridges
          HP Color LaserJet Enterprise M-554 DN
          HP Color LaserJet Enterprise M-555 DN
          HP Color LaserJet Enterprise M-555 X
          HP COLOR LASERJET ENTERPRISE FLOW MFP M-578 C
          HP COLOR LASERJET ENTERPRISE FLOW MFP M-578 E
          HP COLOR LASERJET ENTERPRISE FLOW MFP M-578 Z
          HP COLOR LASERJET ENTERPRISE MFP M-578 DN
          HP COLOR LASERJET ENTERPRISE MFP M-578 F
          HP Color LaserJet Enterprise MPF M-578 DN
          HP Color LaserJet Enterprise MPF M-578 F