These printers use the 6R257 cartridge:
Click On a Printer to View it's Cartridges
          Xerox-Tektronix 1012
          Xerox-Tektronix 5011
          Xerox-Tektronix 5012
          Xerox-Tektronix 5014
          Xerox-Tektronix Copier 1012
          Xerox-Tektronix Copier 5012
          Xerox-Tektronix Copier 5014
          AB-Dick K 120
          AB-Dick K 122