Assuming it's for a K3(s), I don't think you will find the 250 Hz filter very useful.  The response that both Elecraft and I measured shows that the narrow filter really isn't much better.  Were I to do it again, I would only use the 400 Hz ones.

73,
Scott  K9MA

On 12/31/2017 17:02, doug dietz wrote:
Guys
i ordered a 400hz filter by mistake.  I have use for a 200h or 1k, 18.k
  What ya got
[email protected]  Doug WD8Z
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Scott  K9MA

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