C540H1KG LEXMARK C540 C543 TONER CARTRIDGE BLACK RP 2.5K | eBay
Yellow Toner Cartridge for Lexmark C540/C544/X543/X544 - 2000 page yield, Replacement for OEM cartridge
LEXMARK C540 C543 TONER CARTRIDGE YELLOW RP 1K C540A1YG GENUINE ORIGINAL
Amazon.com: Lexmark C540, C543, C544, C546, X543, X544, X546 Series High Yield Magenta Return Program Toner Cartridge (2,000 Yield), Part Number C540H1MG : Office Products