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I like either the Fleetguard or Donaldson replacements. They both have the metal mesh inside the filter that protects from pieces of the filter being sucked into the engine. I usually get the best deal off Amazon.
My Cat C13 also uses the "disposable" EcoLite filter. I got mine (Donaldson brand) off Amazon too, but any reputable supplier can get it.
Note that some air filters on our Coaches work backwards from what is considered normal - meaning that the dirty air enters into the "inside" of the filter and the clean air comes out of the "outside" of filter.
The EcoLite models can flow air in either direction.