Hi there, You can do what I have done and used for the past 15 years on my cb400f, I have removed the paper part of the air filter and used some filter foam, got it from my local motorcycle shop. it is great and from what I can tell it works better than my old paper element did, paper ones didn't do well on dirt road so I went with foam as I can clean it out and reuse it , I used copper wire to hold it on, just tight enough to keep it there