These printers use the 18C0781 cartridge:

Lexmark X 735

Lexmark X 2300

Lexmark X 2310

Lexmark X 2330

Lexmark X 2350

Lexmark X 2350 AIO

Lexmark X 2350 All In One

Lexmark X 2450

Lexmark X 2470

Lexmark X 3370

Lexmark X 3450

Lexmark X 3470

Lexmark Z 730

Lexmark Z 735