These printers use the 108R00581 cartridge:
Click On a Printer to View it's Cartridges
          Xerox-Tektronix Phaser 7750
          Xerox-Tektronix Phaser 7750 B
          Xerox-Tektronix Phaser 7750 DN
          Xerox-Tektronix Phaser 7750 DXF
          Xerox-Tektronix Phaser 7750 GX
          Xerox-Tektronix Phaser EX 7750
          Xerox-Tektronix Phaser EX 7750 DFX
          Xerox-Tektronix Phaser EX 7750 DXF
          Xerox-Tektronix Phaser EX 7750 GX