These printers use the 106R01566 cartridge:
Click On a Printer to View it's Cartridges
          Xerox-Tektronix Phaser 7800 /DN
          Xerox-Tektronix Phaser 7800 /DX
          Xerox-Tektronix Phaser 7800 /GX
          Xerox Phaser 7800 /DN
          Xerox Phaser 7800 /DX
          Xerox Phaser 7800 /GX