The Collins catalog has two filters with the same specs as the 250 hz filter,? except the bandwidth is 200 hz. They may be easier to find.? But is that too tight a bandwidth?
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I have the 300Hz filter and the 2.3KHz SSB filter in the FT-857. I use this rig for POTA activity. I have a 500Hz filter in the FT-818 and FT-817.?
I'm a big fan of CW. This is my primary mode. Filters are great when the band is crowded. I like to ragchew. I'm on SSB maybe 5% of the time.
I hope that you find some filters and have fun!
Best 73, Jack?