Crutchfield is the site you want to look at to see if it fits. Then just look it up on the internet to find it somewhere cheaper. They had a 2004-5 9-3 in their install reference guide. Crutchfield actually disassembles a car to make sure things fit. They won't have the actual connectors anymore but make sure you don't just twist the wires and heatshrink 'em. That affect the ohm resistance. Solder wires to have a good path for the electricity to go. The infinity reference speakers are a good choice. I have them in my doors and they sound alot better.