These printers use the 63H5721 cartridge:
Click On a Printer to View it's Cartridges
          IBM 4324-001
          IBM 4324-003
          IBM 4324 Network Printer
          IBM 4324 PS
          IBM Network Printer 24
          IBM NP 24 Network PTR 24
          IBM Optra N model 240
          IBM Optra N model 245
          IBM UP 24 PS
          Dataproducts DDS 24
          Dataproducts DDS 24 T
          Dataproducts Digital Document Server 24
          DEC LN 24
          Digital-DEC LN 24
          Hitachi Beamstar M-324
          Hitachi PC PL-2600
          HP 8000
          HP LaserJet 5 SI
          HP LaserJet 5 SI MOPIER
          HP LaserJet 5 SI MX
          HP LaserJet 5 SI NX
          HP LaserJet 8000
          HP LaserJet 8000 MFP
          HP LaserJet 8000 DN
          HP LaserJet 8000 N
          HP LaserJet 8000 Series
          HP Mopier 240
          HP Mopier 240 Network MFP
          HP Mopier 320 Network MFP
          Interface-Systems 9324
          Interface-Systems 9624
          Konica Print System 2425
          Mopier 8000
          OCE 6535
          QMS PrintSystem 2425
          Source-Technologies ST 4024
          TROY-Systems 624