Lexmark
56P3301
is compatible in the following Printer Models:
Lexmark Mono Laser
Lexmark X820e (4025-n01,4036-501)
Lexmark X820fe (4025-n01,4036-501)
Lexmark X830e (4025-n02,4036-501)
Lexmark X832e (4025-n03,4036-501)