These printers use the 39V2971 cartridge:
Click On a Printer to View it's Cartridges
          IBM Infoprint 1870 DNX MFP
          IBM Infoprint 1870 DTX MFP
          IBM Infoprint 1870 DNX
          IBM Infoprint 1870 DTX
          IBM Infoprint 1880 BDX MFP
          IBM Infoprint 1880 FDX MFP
          IBM Infoprint 1880 TBX MFP
          IBM Infoprint 1880 TFX MFP
          IBM Infoprint 1880 BDX
          IBM Infoprint 1880 FDX
          IBM Infoprint 1880 TBX
          IBM Infoprint 1880 TFX