SLK-3000B Manual.
I'm at work now, so I can't post pics of my computer, but here's a verbal description slightly (?) better than Antec's.
Contrary to Wisp's comments, you need
2 drive rails, one on each side of your CD/DVD drive (assuming it's a standard height 5 1/4" drive). The mounting rails should be oriented so that the metal tabs (which you can use to pop the drive out of the bay later) are at the front of the drive. Now, the trick is that the drive rails have two sets of holes, one slightly higher than the other. Of course, when I initially mounted the rails, I used the wrong set of holes (mine is an NEC DV-3540A, and I incorrectly tried to use the lower set of holes). A minor adjustment and I was back in business.
To put the drive in the 5 1/4" bay, you have to remove the front bezel of the case (yes, remove the whole bezel, don't just swing open the door). Slide the drive into the top bay, which is already prepped (i.e. Antec ships the case without the the EMI shield covering it) until it clicks. Now, pop out the appropriate bay cover from the plastic front panel, connect power / IDE cables to the rear of the drive, and now you're cooking with gas!