I need to do this too. The guy I just bought mine from installed new OEM units right before he sold it and they are REALLY badly misaligned. So I take it instructions on how to are in the owner's manual? Hope so and I actually am not sure if there is one in the glove box lol.
edit: Just found how to do it on the googlemonster. Amazing what 2 minutes of search engines will do.
-00' Contour SVT #1245 of 2150. Trubendz Borla exhaust, BAT Catted Y, Spec shifter, Injen CAI, NPG Big Brakes, Modded Sunroof.
-98' Mustang GT. PI Engine, exhaust, Cobra front bumper/R hood, 3.73s, deep dish Bullitt rims, lowered, lots of other stuff.