Ok, now I get it. I wasn't sure you meant you pulled a clockspring when you said "needed parts". Figured you may have just pulled the switch like many to mount on the column.
So a did a little Googlefu, and I found this below. ***Disclaimer! I hope I'm not throwing more confusion into this, and messing you up!***
Take a look at 2010AveoLT's response to the 2nd pic on the page. If what he's saying is right, from what I understand, you are NOT prewired for cruise on your existing harness under the dash.
2008's seem to be a transition into the the 2009 to 2011's. Especially the sedans. So you may have the newer wiring. If you watch Shocker's video and you can find the same brown and grey wires he did, (and I used this video on my 2010), you could then just run wiring from the brown and grey to the purple and orange on your clockspring, and everything should work. Then plug the harnesses together anyways to retain the horn.
It should be those 2 green/white wires like I had found in my first post, but the link explains much better on where you'll find a plug on the firewall to tap into.