Okay. My case comes with a 5.25" to 3.5" bracket, but the screw holes don't line up with those on my HDD (it looks like it's mean for a 3.5" floppy drive (why the heck would Cooler Master include something like that as a default?)).
A. Try letting it sit on the bracket with no real attachment (not preferred)
B. Try to jury-rig some way of attaching it. It actually looks like with a bit of drilling and some small washers I could get one screw in on each side. (PREFERRED)
C. Buy a cable. Is there any limit on how long IDE cables can be before you start having problems?
D. Try using brackets like these. My HAF case has button-push drive mounting, but it looks like there are still screw holes to mount things manually.
The adapter in the case works. I had to mount the drive so it was slightly ahead of the actual bracket, so I needed to take out the metal punchout (but it fits behind the replaceable grill). All I need now is the ide to sata adapter, which seems simple enough. Thanks for the help!