Here is what I was talking about. The picture below is the actual front set of brake pads for a 2003 GT Mustang. I think yours are the same. Look at the area's which I circled in red. Notice that for two of the pads, the metal rivets (for lack of a better word) are spaced out closer together than the other two pads. You need to make sure that when you install your pads, that you place the pads with the metal rivets further apart from each other, against the wheel cylinder piston. If you use the pads of which the rivets are spaced out closer together against the wheel cylinder piston, what will happen is when you apply the brakes, the pads will be pushing against the rotor at an angle, which will cause the pad to wear down unevenly. This is because the rivets will come in contact with the lower edges of the wheel cylinder piston. You have to make sure that you install the right pad against the wheel cylinder piston. The pad must sit flush against the wheel cylinder piston. When the wrong pad is used against the wheel cylinder piston, it will also cause the rotor to warp! This actually happened on my son's 2003 GT Mustang. I feel that many people who replace their own pads are not aware of this condition. I for one did not realize this until we had vibrations while applying the brakes and a warped rotor. Hope this helps. Good luck, Tommy.