You should go do some reading in the
Visual Modification forum You will find all the info you need in regards to 22" Wheels.
A standard 5 on 5 bolt pattern is incorrect for this vehicle and you will find massive amounts of info on this site to point you in the right direction.
Just to get you started, the bolt pattern is 5x114.3. There are slim pickings on wheels for this car, but the choices are getting better. Head on over to
bigwheels.net and look at the wheels available for the 2005 Chrysler 300c.