Hi Gang, I have a CW filter here. It fits the rigs listed below. FT-107 FT-707 FT-901 FT-902 FT-101-ZD FT-980 FT-77. I had a 901-DM station and don't remember how or where I got this. I have the box and all the papers. Just make any offer as long as it gets used.This is the narrow 250-hz CW filter. Thanks BOB AF2Q