These printers use the FX6 cartridge:
Canon CanoFax L-1000
Canon Fax L-1000
Canon KC 3170
Canon KC 3175
Canon L 1000
Canon L 3170
Canon L 3170 MS
Canon L 3175
Canon L 3175 MS
Canon Laser CLass 3070 MS
Canon Laser Class 3170
Canon Laser Class 3175
Canon Laser Class 3175 MS
Canon LaserClass 3170 MS