Any kind of 10Base-FL equipment is hard to come by these days, 100Base-FX is getting rare (expensive) too. At one time you could eadily buy 10Base-T -to- 10Base-FL media convertors but even they are scarce.
I keep checking EBay (search for 10Base-FL), there's always some 10Base-FL equipment there, but we all know the risks of buying stuff on EBay.
If you find a good source for 10Base-FL hardware, please post it here, I'd like to have that information myself.