To be sure, you need to find the specifications for both the Grand Prix wheels and the Impala's wheel requirements. Look for information on:
* Bolt Pattern: (e.g., 5x100, 5x114.3, etc.) This is the crucial specification.
* Wheel Offset: This dictates how far the wheel sits in/out relative to the hub.
* Center Bore Diameter: The diameter of the hole in the center of the wheel.
You can usually find this information stamped on the wheel itself, or you can look it up online using the wheel's part number or search for the wheel specifications for that year and model of the car. For the Impala, you'll also need to verify these specifications from your car's documentation or a reputable parts website.