I have the following filters for the Orion and or Omni VI that are now surplus: INRAD # 761 - Can be used on the Orion or the Omni VI ... 9 MHz Center, 1.8 KHz width. Removed from my Orion before I traded it in for the new Orion II. Has original box and packing. $75 INRAD 352 - 9 MHz center and 500 Hz width. $55 Please reply off list. Thanks. 73, Mike W9MWS