The FN comes with plastic sheets. You have to order the metal pans from the bass equipment company. That's where everybody gets theirs from. I can't remember how much mine were but they are good pans.
Here's the link http://www.bassequipment.com/Cages/Ferret+Pans/default.aspx
it's called ferret pans, fits FN142. You can have cut out or both without, depends on how you want to set up your FN. They can custom make 4" pans for you, but you have to call CA stores.