You need to provide more information. By saying that you got a stereo with an aux port are you talking about a female 3.5mm port? Those are the most common but you never know.
If there is a small port on the front of your unit that looks like you would plug a pair of headphones in it then thats it.
As for the second item you posted. It would not work, its only an extension cord. You basically need a male to male cord.
http://www.radioshack.com/product/in...entPage=search