I had some cheap plastic see-through filters on my bike briefly. They came from the lawn mower section of my local hardware store. On the highway the Norton would starve for fuel and I had to back off to 45 MPH. So whatever you use, be sure that they can flow enough to keep up with the motor's needs. I also recommend metal enclosures (those Pingle's look nice), as plastic can deform if the lines aren't long enough to prevent a tight radius.
I only used them because the Chinesium petcocks I had would shed bits of rubber from the internal seals that would get stuck in my carbs. After switching to BAP fuel taps the filters were unnecessary.