These printers use the 56F1H00 cartridge:

Lexmark MS 321

Lexmark MS 321 DN

Lexmark MS 421

Lexmark MS 421 DW

Lexmark MS 421 DN

Lexmark MS 521

Lexmark MS 521 DN

Lexmark MS 621

Lexmark MS 621 DN

Lexmark MS 622

Lexmark MS 622 DE

Lexmark MX 321 ADW

Lexmark MX 321 AND

Lexmark MX 421 AND