Next time you're down there make sure the original is not still there. On my truck someone added a new easy to access filter because they either couldn't find or access the original one. I found the original, juts haven't gotten around to replacing it, thank fully it's not clogged.
If your truck is the regular cab and short bed, like mine, it's the hardest one to get to (you have to go though the rear wheel well). If you have the extra-cab or the long bed, it's pretty easy.