Hi Arthur
Look at the cable that would connect to the hard drive.
The Data side is either SCSI, or ATA or SATA.
Look these up on Google and see what matches.
All modern Hard Drives are 3.5" for desktop computers or 2.5" for laptops. Visit a site such as OWC (Other World Computing) to purchase a drive.
Only Xerox would have the OS unless you know where there is an old copy.
Check out
https://www.google.com.au/?gws_rd=ssl#q=xerox+7435+specs
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