These printers use the Q7551X cartridge:

HP LaserJet 3005 D

HP LaserJet 3005 N

HP LaserJet 3005 X

HP LaserJet 3035

HP LaserJet M-3027 X MFP

HP LaserJet M-3027 MFP

HP LaserJet M-3027 X

HP LaserJet M-3035 XS MFP

HP LaserJet M-3035 MFP

HP LaserJet M-3035 XS

HP LaserJet M-30300

HP LaserJet P-305 N

HP LaserJet P-3005

HP LaserJet P-3005 D

HP LaserJet P-3005 DN

HP LaserJet P-3005 N

HP LaserJet P-3005 X