These printers use the CE400X cartridge:
Click On a Printer to View it's Cartridges
          HP LaserJet Enterprise 500 Color MFP M575 F
          HP LaserJet Enterprise 500 Color MFP M575DN
          HP LaserJet Enterprise 500 Color M 551 DN
          HP LaserJet Enterprise 500 Color M 551 N
          HP LaserJet Enterprise 500 Color M 551 XH
          HP LaserJet Enterprise 500 Color MFP 575 DN
          HP LaserJet Enterprise 500 Color MFP 575 F
          HP LaserJet Enterprise Color flow MFP M-575 C
          HP LaserJet Pro 500 Color MFP M570DW
          HP LaserJet Pro 500 Color MFP M570DN