hello. I have a 96 gt mustang. Was wondering it 18x10.5's are to wide, I think they might.

will 18x9 in front and 18x10 in the rear be fine.

And is the bolt pattern the same from a 96 mustang to the newer ones (05 etc.)

 

A 18 x 9 and 10 will work given the correct specs, a 10.5 may be too wide.

The bolt pattern for the 05 and 96 is the same.