I have three IF filters pulled from a Yaesu FT-1000MP.  These are all made by International Radio in the US.  You can search for specifications on this page:

https://www.inrad.net/home.php?cat=4

#708 8215 kHz IF 250 Hz CW filter, also suitable for FT-920, Elecraft K3

#711 8215 kHz IF 1.8 kHz SSB filter, also suitable for FT-847, FT-890, FT-900, FT-990

#714 455 kHz IF 1.8 kHz SSB filter, also suitable for FT-847, FT-890, FT-900, FT-990

$100 per filter, plus shipping by Canada Post

The #703, #704 and Roofing Filters you see in the photo have been sold.