i just opened the air box today, and it is SO DIRTY that i can't be cleaned. i need to get a new filter, but where can i get it? is it the same as the comptech cai filters? or is it different? please direct me to where i can order this. and around how much it'll cost. thank you!

btw, anyone know what the diameter for the opening is? coz the one i took out the the shape is messed up, and is not round anymore

 

I've got both and they look the same.