I'm not sure which models I can harvest a replacement unit from, but I know where to turn for the answer..

I currently have a Xerox VersaLink C7025 unit that needs a 2 drawer PFU unit added. I wanted to know which models and series of machines I could harvest this PFU from? I couldn't seem to find that answer anywhere else, but the largest pool of experience for Xerox would probably be right here on CopyTechNet. Thanks in advance for your help!