These printers use the 51650M cartridge:
HP DesignJet 230 D-Size
HP DesignJet 230 E-Size
HP DesignJet 250
HP DesignJet 250 C
HP DesignJet 250 C D-Size
HP DesignJet 250 C E-Size
HP DesignJet 650 C
HP DesignJet 650 C PS
HP DesignJet 650 CD
HP DesignJet 650 CE
Newgen Vista Color Plotter