B6P40 -80004 Timing Encoder Scale Strip for HP OfficeJet and OfficeJet Pro

CR Printhead CarriageTiming Encoder Scale Strip B6P40 for HP OfficeJet Too many compatible printer models to list here.  You should find a black text on your old encoder, if it says B6P40-80004 then it is.
HP OfficeJet 8010e All-in-One Printer (228G2D)
HP OfficeJet 8012e All-in-One Printer (228F8B)
HP OfficeJet 8012e All-in-One Printer (228G3D)
HP OfficeJet 8014e All-in-One Printer (228G0B)
HP OfficeJet 8015 All-in-One Printer (1KR58A)
HP OfficeJet 8015e All-in-One Printer (228F5A)
HP OfficeJet 8015e All-in-One Printer (228F9B)
HP OfficeJet 8018 All-in-One Printer (6SB41D)
HP OfficeJet 8022e All-in-One Printer (1K7K6A)
HP OfficeJet Pro 8020 All-in-One Printer (1KR62A)
HP OfficeJet Pro 8020e All-in-One Printer (229X1D)
HP OfficeJet Pro 8022e All-in-One Printer (229W7B)
HP OfficeJet Pro 8024e All-in-One Printer (229W8B)
HP OfficeJet Pro 8025 All-in-One Printer (1KR57A)
HP OfficeJet Pro 8025e All-in-One Printer (1K7K3A)
HP OfficeJet Pro 8025e All-in-One Printer (229W9B)
HP OfficeJet Pro 8028 All-in-One Printer (1KR61A)
HP OfficeJet Pro 8028e All-in-One Printer (1K7K7A)
HP OfficeJet Pro 8035 All-in-One Printer (3UC66A)
HP OfficeJet Pro 8035 All-in-One Printer (4KJ65A)
HP OfficeJet Pro 8035 All-in-One Printer (5LJ23A)
HP OfficeJet Pro 8035e All-in-One Printer (1L0H6A)
HP OfficeJet Pro 8035e All-in-One Printer (1L0H7A)
HP OfficeJet Pro 8035e All-in-One Printer (1L0H8A)
HP OfficeJet 6962 
HP OfficeJet 6978 
HP OfficeJet 6968
HP OfficeJet 6230 
HP OfficeJet 6830 
HP OfficeJet 6968 
HP OfficeJet 6970 
HP OfficeJet 8020 
HP OfficeJet 8028