ATA 133 100 66 ROUND IDE
Those are almost exactly the same. Those are all IDE cables which will fit on your CD-RW and whatnot....but the difference is in the speeds...133 means 133mb/sec but you'd need to find out if your drives are ata100 or ata133...
Of course the one that says 100/133 means it handles both speeds, and the other one that goes down to 66 handle all those speeds.
Just go with ATA 133/100/66 Round IDE
Jak: That's the really long and difficult way to make round cables..
All you really gotta do is fold the cable in half a couple times and it comes out the same way.
You can BARELY make out my round cable in this pic:
It's to the right of the CPU and RAM, and you can see it going up and it's pretty clear between the HD and the CD-Rom....just look for the CD-ROM and follow it's cable, but yeah you can see it there.
I just folded it 2 or 3 times over and it comes out no thicker than a regular bought round cable. Much quicker and easier than trying to slice each cable IMO