I have two Ten Tec crystal filters that I no longer use. I used them in my Omni VI, but they also work in the Omni V and one works in the Corsair II. Model 288 1.8 khz filter for the 6.3 mhz IF. Model 219 250 hz filter for the 9 mhz IF I will mail either filter to the USA for $65. Please reply direct. Thanks! Jim N4AL n4al at arrl.net