I’m in the same rowboat looking for the XF-8.9 AM filter for one of my FT-901DM’s. Sold my FT-980 awhile back and sold a crap box FT-One with every option and filter in it shortly before that. Kinda wish I’d of kept the FT-One because I sold it for a lot less than what all the filters were worth. Anyhow, if you’ve got an extra AM filter, I’ve got an XF-8.9HC for you.
Regards,
Terence VE3KKM