Yep, and you can also buy a
filter pad a little larger than you need; there are quite a few we carry that are made to be cut to size. You could easily affix one to the frame you have similar to what f8fan said and that would work.
If you're looking for the exact filter pad it might actually be a
cartridge. That'd be easiest to find if you know the brand/model of the filter.
Either way it should work for you.
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