What you need is an active termination in each end of the SCSI cable as the SCSI controller lacks termination on it's own. Any UWSCSI HDD should work but these disk are usually for servers so noise might be an issue, best is probably to go with a UWSCSI->IDE converter and get hold of a big and quiet IDE disk. Only UWSCSI CDRom I've ever seen was in a IBM server (before I hoocked it up to my CSPPC setup) else you'll have to go the traditional SCSI2 CDRom through a UWSCSI->SCSI1/2 converter. Finding a drive that is also short is not the easiest task, might need to make a custom PSU for the computer.
