lexmark cartridges

Black = Lexmark #16 (10N0016)  Color = Lexmark #26 (10N0026).  I have used the black (#16) in my A920 with excellent results. I have not changed out my original Dell color print cartridge yet. The Lexmark #26 is the equivalent color print cartridge. I bought a black Lexmark 2-pack at Sam's Club for about $46. The single black cartridge at Sam's Club (#16) is $24.68. The cartridges appear to have the exact same dimensions, electrical contacts, etc. as the Dell-supplied cartridges. The cap color was different and, of course, it read "Lexmark 16" on the side. I installed the black cartridge and it fit perfectly. No modifications were needed. It was a simple install. Check your owner's manual for installation procedures...very simple. The A920 software recognized it as a new cartridge and the black print cartridge icon showed a full supply of ink. I have used it for several months with no problems at all.