Quick Q on BIX

Just picked up a used black ice extreme from someone but it came with now mounting screws. What kind of screws do you use? I tried half a dozen sizes from mobo, case, and fan screws. They are either too big or too small so that the screw just falls through that little hole. And there's not enough room to reach behind that little plate to attach a nut if I were to use a bolt or something. I'm sure there's something simple I'm overlooking...

#8-32, how ever long you want them. The holes on the BIX aren't threaded, but the #8-32's make their own threads.