Here is a web site link that contains Pontiac's specs/options... as they sit now with the 2004 GP. They update it periodically.
At the site click on Print Book, then select 2004 Grand Prix from the drop down.
You can chose by section or click on Print Model to get the entire document.

http://eogld.ecomm.gm.com/NASApp/domestic/vehiclesel.jsp?regionID=1&divisionID=7#