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