I have for sale an Icom FL232 350hz CW filter, and an Icom FL101 250hz CW filter. These work in the 706/725/726/728/729/736/737/738/746/756/761/765/775/781 radios. They will not work in the 703/707/718 rigs. I am asking $80 shipped for each one, and can take paypal/check/MO. 73 John AF5CC