These printers use the 8R7903 cartridge:
Xerox-Tektronix Document WorkCenter Xi-70 C
Xerox-Tektronix Document WorkCentre XI-70 C
Xerox-Tektronix DocuPrint C-11
Xerox-Tektronix DocuPrint C-15
Xerox-Tektronix WorkCenter Xi-70 C
Xerox-Tektronix WorkCentre XI Series