@Jim well now you had me second guessing so I went to research and even I don't know what the filter was meant for specifically. It does look similar to a rotax filter I saw on ebay. On the K&N website I can't seem to find it even using the style and dimension. It does seem the triumph crowd uses them on their bikes; Mine came off a 2004 Triumph Speedmaster and seems you can find them for other Triumph models.
https://www.ebay.com/itm/04-2004-TR...137328?hash=item52215e2930:g:QRAAAOSw51tdS0uh
https://www.ebay.com/itm/04-2004-TR...137328?hash=item52215e2930:g:QRAAAOSw51tdS0uh
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