Hi Butch, i'm not sure if you know but the filters in an FT1000MP Mark V are also compatible in the FT847.? This might expand your ability to locate one.? I searched a long time for the 500 Hz CW filter without luck until I learned about the cross-compatibility.? I was searching "FT847 CW filter" (and variations of) and was finding nothing or listings with rediculous greedBay prices.? Skeptical, I did a lot of image searches for the CW filters for both radios and compared them and they looked the same.? So I took a chance and started searching "FT1000MP CW filter" and in short order I was able to find one being parted out by an FT1000MP owner.? I too am looking for the SSB filter.? A couple of times I almost convinced FT1000MP owners to part with their 2.4 kHz SSB filter but failed.? Someday!? :-)
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This was the site where I first discovered the cross compatibility.? Scroll down about half way for the SSB one.
Richard