That looks like a pretty standard PATA to SATA converter which would only be of use to a kuro or HG.
The Kurobox Pro already has a second perfectly usable SATA port. Except it's on the front? Whatsup wid dat?
Ditto for the PCI-E 1X slot which would be useful to add two more SATA ports, except that there's no way it would fit in the box, maybe I can find/hack a cable for that one and mount it over the mainboard, but I'm not hopeful.
Anyhoo, I went to Fry's and bought a Nextar.3 external USB/e-SATA box which handily includes a SATA to e-SATA bracket. After a little slot cutting and drilling on the frame (after complete disassembly of course! and blowing out any metal dust. I now have an e-SATA port on the back of my Kurobox Pro:
Picture here: http://nas-central.org/index.php/Image:Rear-esata-kuroboxpro.jpg
edit: I may have a permission problem on this page. Help?
Wiki article to follow in my copious spare time, plus I'm wiki-challenged.
I needed the e-SATA box anyway, so it wasn't a bad deal at $50 to satisfy my hardware jones...
And yeah, I don't know if you can see it clearly in the photo, but I KNOW my case-mod skilz suck!