These printers use the 016-1879-00 cartridge:
Click On a Printer to View it's Cartridges
          Xerox-Tektronix Phaser 7700
          Xerox-Tektronix Phaser 7700 DN
          Xerox-Tektronix Phaser 7700 DX
          Xerox-Tektronix Phaser 7700 GC
          Xerox-Tektronix Phaser 7700 GX
          Tektronix Phaser 7700
          Tektronix Phaser 7700 DN
          Tektronix Phaser 7700 DX
          Tektronix Phaser 7700 GX