Have you measured yet?
HERE is a pdf which shows how to measure for spacers.
HERE is a link to our spacers, make sure to get the proper lug bolts when ordering spacers, if you need help figuring that out feel free to blast me a PM.
Several guys are rocking 30mm in the rear and 20mm in the front on the X with stock wheels. Flushed wheels on an X just looks amazing to me, can't wait to see yours when you decided on the set up you're going with!
ECS Tuning