Technical Frog Mouth Scoops - Air Cleaner?

Where can I get air filters like these?

 

Clarify, I have the scoops. I need the filters.

 

That's just stainless mesh formed from inside. My scoops came with a square of mesh in each box when I bought them

 

Wouldn't really call them filters. They keep the local wildlife out of the engine, but other than saving a few small birds they don't do a whole lot.