Hi, I'm looking for the Inrad filter #762 (600Hz for ORION at the 1000Hz slot) I have a spare Inrad #357 (2800Hz for ORION II, Eagle, RX-366) available. After acquiring the #762 I can also loose the ORION's original 1000Hz(4-pole) and 500Hz(8-pole). 73 Mark, PA5MW