That's what I have now but they're not rounded, just generic IDE cables that came with one of my motherboards. I used a utility knife to cut them and they work great but flat IDE is soo freaking ugly.
I was hoping another SFF dude had already tried them and could give me a thumbs up or down either way. I may just wind up ordering a few pairs and if they don't work for the optical drive on the Shuttle then I'll use them on one of my other cases since the HD's are soo close to the ports.
When I'm not paying insane prices for little bits of computer hardware, I'm paying insane prices for little bitty cars.