These printers use the 106R01319 cartridge:
Click On a Printer to View it's Cartridges
Xerox-Tektronix WORKCENTRE 6400
Xerox-Tektronix WORKCENTRE 6400 S
Xerox-Tektronix WORKCENTRE 6400 SFS
Xerox-Tektronix WORKCENTRE 6400 X
Xerox-Tektronix WORKCENTRE 6400 XF