Just acquired a used K3/10 with no options, and am looking to buy some. Thought I would try here before ordering new. If you are interested in selling any of the following, please let me know: KAT3 (can swap standard 1-antenna connection board if needed) KXV3 or 3A CW filters, 5-pole versions are fine Please contact off list. Tnx & 73, N4UW