i just lifted my 03 chevy blazer zr2 with a 2inch pa body lift and i am going to put 18x9 rims on it...i know i have to shave to fit 12inch wide tires and i plan on shaving but wont they touch the sway bars inside? so do i put 1.25inch front spacers and 2 inch rear spacers to fix that problem?

 

Check the backspacing on your rims chances are if they are spaced out further(in your case quite a bit further since they are 9" wide rims and 12.5" wide tires) you might not need spacers just a cutting tool for your fenders!