These printers use the 51650C 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