HP Stand C7781A is compatible in the following HP Models:

HP DesignJet Printer Stands/Media Bins

HP DESIGNJET 500/800 STAND & BIN - C7781A

HP DesignJet 800 Printer series

HP DESIGNJET 800 PRINTER (24 IN) - C7779B
HP DESIGNJET 800 REMARKETED PRINTER (24 IN) - C7779BR
HP DESIGNJET 800PS PRINTER (24 IN) - C7779C

HP DesignJet 500 Printer series

HP DESIGNJET 500 24-IN ROLL PRINTER - C7769B
HP DESIGNJET 500 42-IN ROLL REMARKETED PRINTER - C7769BR
HP DESIGNJET 500PS 24-IN ROLL PRINTER - C7769C
HP DESIGNJET 500PS 24-IN ROLL REMARKETED PRINTER - C7769CR