5.25inch bays are the ones used for CD drives, the one above your hard drive cage, bungies are a way of mounting hard drives
http://forums.overclockers.co.uk/showthread.php?t=18269719
Or if you wanted to do a less pretty but just as good solution.. get a hacksaw and cut the top half of the 3.5inch hard drive cage off
+1 for a hacksaw and a case mod
Once the sides back on you wont see it
It's nothing technical it's just carefully destroying a bit of your case, if you're really scared you could remove the mobo, but getting a smaller, less powerful card when you've got a great one already there.. 
