Hi. Depends on what you plan to do/how you want it to look? I my file (Joe's 72)my car has 15X10 Cragar SS on the back. On the front NOW...it has 15X4 SS. In the photo it had 7" fronts. After lifting it only 1 1/2-2" in the rear...it has NEVER even tried to bottom out.Just my 2 cents,Joe