These printers use the 20-090 cartridge:

NEC LCR 50 X

NEC Superscript 600 Plus

NEC Superscript 660 Plus

Sharp Fax FO-4500

Sharp Fax FO-4550

Sharp Fax FO-5500

Sharp Fax FO-5600

Sharp Fax FO-6500

Sharp FO 4500

Sharp FO 5500

Sharp FO 5600

Sharp FO 6500

Sharp FO 6550

Sharp FO 6600

Sharp FO 6650

Sharp FO 7500

Sharp UX 5000