Originally Posted By: oilmutt
The 2005 Malibu does not come with cabin air filter,through trial and err i found the 2005 Saturn Ion, Chevy Cobalt and Pontiac G6 fit just fine.To this day when the wife takes the Malibu to the dealer they refuse to install a cabin air filter because GM says they don't make one for her car.
My mother in law has a 2004 Kia Optima. It didn’t come with one, either, but it has a slot for it. The filter is completely different than AZ or AAP recommends. The slot is about 2”x6”, but the filter is 1”x10”. Oddly enough, Amazon recommended the two-pack of filters for a 2002 Chevy Tahoe. I put them in side by side and they fit!