 Now, we do have ways for you to be sure of what size. There's a template you can download from our site and print it out on your printer. And you just cut out these little shapes and you stick them in the gap. And then that will tell you what size you should use. You can also get samples. We have sample kits that contain all the sizes and all the colors. And then you'll really get an idea of how well it fits and how well it will hold.