It is not recommended to install 13 or 14-inch wheels on your 2002 Cadillac Deville without proper modifications as the standard factory fitted wheel size on a 2002 Cadillac Deville is 16 inches to house its disc brakes and suspension system to accommodate this vehicle class and weight.
Installing wheels smaller than those specifically designed for your model can compromise safety, negatively impact handling, ride quality, braking performance, and potentially damage various crucial vehicle components due to fitment or clearance issues.