Someone bought a filter from Green that they said fitted, he showed pics and whilst it fitted the recess it didnt look quite right to me but pictures can be deceiving. IIRC it cost about £55 and was their reusable cotton filter.
Back In the day when I first enquired and set up the thread on the new old thaoc, I had an agreement with Pipercross that if we had 30 orders they would set up the tooling to do the filter. We never got 30 names and no other manufacturer has since come out with the application for the airbox fitted to the 2.2 ICTDI accord (its different to the icdti civic).