These printers use the 016-1831-00 cartridge:
Click On a Printer to View it's Cartridges
          Xerox-Tektronix Phaser 850
          Xerox-Tektronix Phaser 850 DP
          Xerox-Tektronix Phaser 850 DX
          Xerox-Tektronix Phaser 850 N
          Tektronix Phaser 850
          Xerox Phaser 850
          Xerox Phaser 850 DP
          Xerox Phaser 850 DX
          Xerox Phaser 850 N