Do you have a floppy controller from 1989 that would work? I have a 5.25" drive I could lend you (sentimentally I want to keep it) but not the controller boards.
I checked http://www.vfxweb.com/ for some 5.25" as they usually are the place to go for old stuff but they only have 3.5" drives.
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I seem to recall the 1990's versions plugged in using the same cables as a 3.5" floppy. If it needs a seperate controller card then I won't bother; I would just tell my user that he needs to go to a data recovery place.
I think I have an external you can just have (connects via USB) stuffed away somewhere. I will check tomorrow when I'm doing my chores and let you know.