Hi Blaek. Yes, the new wheels must have the same bolt pattern as stock, unless you are going to get into installing lug/bolt adapters (which I would not recommend).Thank you for the information. Do you know where I can find rim options based on the tire sizes? For example, rim options for 255 40 18. Also the bolt pattern must be the same 5x108 as stock? I don't know much right now because I just started to study about wheels and tires.
And you want to make sure all four corners of your vehicle use the same/extremely similar overall diameter wheel/tire, in order to ensure speedometer/odometer accuracy, avoid damage to the AWD system, and ensure proper operation of the ABS, TCS, ASC systems etc.
Here is a Tire Size Calculator which may help you fit properly sized wheels/tires to your Fusion: Tire Size Calculator
You input your factory wheel/tire size, and the aftermarket wheel/tire size to compare overall diameter.
Let us know how you make out and good luck.