Air Filter

Took my air filter off yesterday, new to this job of taking off things on my carrier, air filter looks good , does ford make replacement air filters? and how in the hell does it come apart after screwing the bottom off?, The inside looks like little tiny matress springs still in silver colour ALSO can someone tell me the correct size bolt or rivit that goes into the armour plating. thanlks


CEERS YHOS

BIG MIKE