I have a 19 with the Bose system. You can just swap the speakers but get the connectors from crutchfield or you’ll end up having to cut the factory one off the oem speaker wires.
The timing ends up a bit of a mess and the infinity coax’s that I used are way to bright causing me to have the treble turned almost all the way down but it’s manageable and a heck of a lot better. Start with the 6x9’s though as I mentioned, you may not need to change the dash speakers.