Regarding sizing of the wheels, its most important to make the tire outer diameter compliment the wheel well. If there is a significant difference in diameter between the front and rear tires, the wheel size can be staggered to emphasize this difference.
The narrow body Panteras have approximately a 25 inch OD front tire, and a 27 inch OD rear tire as they came from the factory. The wheel wells of the narrow body Pantera are arched to compliment this difference. So I installed 18 inch front wheels and 20 inch rear wheels with great success.
Laslo's wheels were also staggered 2 inches, and were designed to fit a specific tire combination. The Group 4 wheel wells of Laslo's car were most likely designed for a staggered tire diameter, or Lazlo modified them to fit his selected tires properly.
The GT5 & GT5-S were equipped from the factory with 24.5 inch diameter front tires and 25 inch diameter rear tires. that's not much difference in front and back diameters. so my advice is do not stagger the diameters of your wheels front to back. Also, choose your tires carefully to keep the diameters around 25 inches, so they will look proper in your GT5 wheel wells.
cowboy from hell
