shimano sahara 2500fd spool compatibility

i have a shimano sahara 2500fd and would like to know if a spool from a sahara 2500fb would fit and work on the reel. If not do any other spools fit or would i have to use one for the 2500fd? The spool is half the cost of the reel which seems a bit excessive, there seems to be many other shimano spools on ebay at a much more realistic price but never any for the sahara 2500fd.