You can do an attibute search at Donaldson, and then use their listings and Wix to find all manner of conversion.
I'd note that your quest is probably moot; you can upsize your filter if you want, but it's not needed. Most any filter application has way more capacity that you're going to need, and the tiny amount of efficiency gain you might experience will not manifest into better wear results.
And while the Kia warranty is probably expired (or near it), the filter warranty will not cover what they consider to be a mis-application of their product.
Caveot emptor.