I'm not seeing anything in the service manual about a pollen or cabin filter - I assume that the Copen doesn't have one. Is that correct?
I'm don't know a link. But I know Adam knows where they can be found, may be at DSport. Fitting it goes in behind the glove box. From what I remember it was very expensive to put a filter in.
The pollen filter was a dealer option in Japan. I've tried to find the thread with the details, but can't find it. http://i125.photobucket.com/albums/p52/yoshila/ACFilter.jpg