Headset for Xbox 360?

Hey,

Im trying to figure out how to get my headset (That I use for PC) To work with my Xbox 360?

I know the Mic had to be converted to the Xbox360 Controller port and I need an adapter. Thats not the main problem.

What Im trying to figure out is how to get the 3.5mm of the PC to work with the xbox's output RCA.

I saw one product:
http://www.tigerdirect.ca/applicat [...] nJQTu9LH4Q

Would this work? I have a Surround Sound System for my PC with an AUX connection slot. I was thinking I could just plug that in? Would I still get 5.1 Surround?

Also for 360 Headsets what kind of Converter do I need? Is it 3.5mm to 2.5mm? I'm not entirely sure, I want to use my Headsets 3.5mm (SteelSound 5Hv2) jack with my xbox controllers headset jack.

Thanks!

(PS Im from Canada so canadian resources are a must! I dont want to pay $20 shipping for items that are less than that...)