* Bolt Pattern: This is the most crucial factor. Both likely have the same 5-lug bolt pattern (the number of lug nuts and their circular arrangement), but the *diameter* of the bolt pattern circle (PCD - Pitch Circle Diameter) needs to be the same. A slight difference can prevent the wheels from even mounting.
* Wheel Offset: This refers to the distance between the wheel's mounting surface and its centerline. Different offsets can cause the wheels to sit too far in or out, potentially rubbing against the suspension, fenders, or brakes.
* Hub Bore: The center hole in the wheel needs to fit snugly over the hub of the car's axle. Too large, and the wheel will wobble. Too small, and it won't fit at all.
* Wheel Width and Tire Size: Even if the bolt pattern and offset are compatible, wider wheels might require different tires and potentially cause rubbing.
In short: You need to find the specifications (bolt pattern, offset, hub bore) for both the 2005 GT wheels and the 2001 GT's wheel hubs. These specifications are usually stamped on the wheels themselves or can be found online through wheel databases or parts catalogs. Only when those numbers match precisely can you be sure of a proper fit. Even then, tire size might need adjustment.
