Camry 2004 head unit (sept edition) = 2005 Model?

[cheesemethod]

I've got a 2004 (September edition) sportivo camry and want to create an AUX input for iphone use like the below link.

http://www.ebay.com.au/itm/3-5MM-iPhone-5-Charging-Car-MP3-Interface-AUX-In-Adapter-For-Camry-Corolla-Yaris-/281655191022?pt=LH_DefaultDomain_15&hash=item4193f525ee

These plug into the CD changer on the back of the deck so you can control your playlists etc with the factory stereo.

However these products are dated 20XX-2004 or 2005-2010 where I assume that the connection port at the back of the deck changed.

In this regard is the 2004 september edition = to the 2004 model or the 2005 model?

The other option is just upgrading the headunit which is obviously more expensive and I have no knowledge in our to make sure the steering wheel controls still work.

Thanks!

[sportivo2007]

You can just replace the unit with a upgraded Toyota unit from eBay 100-150