Encoder Disk CB021-80053 Fits For HP Officejet Pro 8000,8000,8500,8500,8500,8000,8500,8000,276DW,251DW. Disk Encoder sensor card Q5669-20570 Fir for HP T1100 Z3100 Z5200 Z2100 T610. Encoder strip 44in Q6659-80003 FOR HP DSJet fit for For HP 3100 Z3200 T1100 2100