2005 Pontiac Sunfire cd install,help!!!

Recently purcahsed a 2005 sunfire,want to install a new Kenwood cd/mp3 player.
what kind of wiring harness do I need??
All I can find is one that's used on vehicles up 1999.
is there a different on on this vehicle in particular????
Any help greatly appreceiated...
thanx in advance.....

Your cd player did not come with a harness??

if it is the same as my 02 cavy you will need something like this

http://www.crutchfield.com/S-nijeNL6RMbm/cgi-bin/prodview.asp?i=120GMRC01