Wheel spec help

Ok i have looked around found a few things that have helped me out in my search through mustang wheels. i came down to knowing that i need to get 94-04 wheel for the fitment to be as close to right as possible. but im not looking for stock wheels. im looking into the gt500 rep for a 94-04

now here are the spec on this said wheels.
Front Wheel

Style: 2010 GT500
Finish: Black
Size: 18x9
Centercap Size: Large (2-1/2")
Back Spacing: 6.2" (157mm)
Offset: +30mm (1.2")
Bolt Pattern: 5x4.5" (5x114.3mm)
Fitment: 1994-2011 V6, GT, Bullitt,
Mach 1, SVT Cobra,
Shelby GT500

REAR Wheel
Style: 2010 GT500
Finish: Black
Size: 18x10
Centercap Size: Large (2-1/2")
Back Spacing: 6.3" (161mm)
Offset: +24mm (0.9")
Bolt Pattern: 5x4.5" (5x114.3mm)
Fitment: 94-04 V6, GT, Bullitt, Mach 1, and Cobra


Now the main question will i need spacers (probably) and what size spacers will be needed? 1 inch 1.25 inch 1.5inch????

 

[J_Train]

Guess no one has tried or knows?