These printers use the 8R7904 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