first, will the 03-04 cobra mirrors fit my 03 gt? also does anyone know how hard it is for the install cause im thinking of doing it myself. any info would be great.

 

Those mirrors will fit your car and it's not that hard to do. Just have to open your door, remove the plastic cover, opposite of your mirror, or if you have 460, take that cover off. you'll see the 3 screws to remove. most likely will have to remove the door cover to access the electrical connector, but it's easy.