These printers use the 18C1429 cartridge:
Lexmark X 2500
Lexmark X 2530
Lexmark X 2550
Lexmark X 5070
Lexmark X 5075
Lexmark X 5320
Lexmark X 5340
Lexmark X 5410
Lexmark X 5495
Lexmark Z 845
Lexmark Z 1300
Lexmark Z 1310
Lexmark Z 1320