exactly which fender 5-string?
allparts has 4-string sets of vintage threaded saddles, and they're cheap enough you could probably stomach buying 2 sets to get the 5th saddle.
basspartsresource has the USA fender 5-string bridges with the threaded saddles.
the issue here is that these threaded saddles are the wide, vintage-spaced variety, and so too big for lots of other 5-strings, which are more narrow.
Guitar Repair Gnome
Alpha Music, VA Beach