I have an Icom FL101 250hz narrow CW filter for the 9mhz IF of many Icom radios for sale. It will work in the 706/725/726/728/729/736/737/738/746/756/775 radios. It will not work in in the 703/707/718 radios as those use a 455khz IF filter. I am asking $75 shipped and can take paypal/check/MO. 73 John AF5CC