Perry Wolf did it on his 95 Contour Zetec and I'm sure it will work on your Mystique.
I'm not sure if it will fit under 14" wheels though, but they will fit under 15" wheels.
One caution, your spare will not fit over the larger rotors so it will only be able to be used on the rear. If you were to have a flat on the front, you would need to mount the spare on the rear and move the rear to the front.
Jim Johnson
98 SVT
Originally posted by ggee6688:
Us tique owners want to know if it is possibile to put bigger rotors on our GS 4 bangers w/o changing calipers and all kinds of stuff. From a 260mm to the svt size????