I recently bought a Nexus 120 mm case fan. When I started to install it, I saw that instead of having a small hole for the mounting screws, the holes on the fan went clear through the width of the fan and were about an inch in length. I have some extra fan mounting screws from the case but they're just short little things. So, my question is do I have to buy special screws or sleeves or something to mount this fan? My case, an Antec Performance One, has a bracket that the fan goes on, if that makes any difference... Thanks!