does anyone know how the fitment is when using an 18" factory GT rim from 05-08 on a 94-04?? i have seen a 1995 GT with 2005 bullit wheels on it but before i go and buy i want to be positive . i heard somewhere that the offset or backspace is different???

 

Backspace is probably different since the rims aren't the same width. Works out to a difference of about 1/10" which isn't going to be an issue.