Lexmark 40X5491 is compatible in the following Printer Models:

Lexmark Multifunction Color Laser

Lexmark X543dn (7525-131)
Lexmark X543dn /DBCS (7525-133)
Lexmark X544dn (7525-336)
Lexmark X544dtn (7525-336)
Lexmark X544dn /DBCS (7525-337)
Lexmark X544dtn /DBCS (7525-337)
Lexmark X544n (7525-356)
Lexmark X544dw (7525-386)
Lexmark X544dw /DBCS (7525-387)

Lexmark Color Laser

Lexmark X543dn (7525-131)
Lexmark X543dn /DBCS (7525-133)
Lexmark X544dn (7525-336)
Lexmark X544dtn (7525-336)
Lexmark X544dn /DBCS (7525-337)
Lexmark X544dtn /DBCS (7525-337)
Lexmark X544n (7525-356)
Lexmark X544dw (7525-386)
Lexmark X544dw /DBCS (7525-387)