These printers use the CH565A cartridge:
Click On a Printer to View it's Cartridges
          HP DesignJet 500
          HP DesignJet 500-24-Inch
          HP DesignJet 500-42-Inch
          HP DesignJet 500 PS
          HP DesignJet 500 PS 24-Inch
          HP DesignJet 500 PS 42-Inch
          HP DesignJet 510
          HP DesignJet 510-24 IN. Wide Format
          HP DesignJet 510-42 IN. Wide Format
          HP DesignJet 815
          HP DesignJet 815 MFP
          HP DesignJet 820
          HP DesignJet 820 MFP Wide Format
          HP DesignJet 820 MFP
          HP DesignJet 820 PS
          HP DesignJet Copier CC-800 PS