Sadly they do not have order numbers as they are not ever needed to be replaced really.
Even as a Xerox employee i cannot find a way to order one, the HDD and the SATA cable do not come with it when ordered. I know a Xerox technician can order things like this with a special process called a non spared parts request but I assume you have no maintenance agreement so that could be a very expensive option.
Unofficially speaking, I would probably just duct tape it in there.
Recently acquired two Workcentre 7855's previously from Gov't Use. Their techs removed the Hard drives - which wasn't an issue, but they didn't replace the hard drive mounting trays back on the motherboard! I have not been able to reference a replacement part number for ordering. Any ideas how to resolve this issue?
Thanks