That is the same kit west coast performance parts sold me my first time around, before the parking attendant at my building dented my bumper....thus I got a new bumper.
Anyway, the kit is good, but it does overhang on the bumper, about 1/4 inch....not much and not really noticable...but depends on the person. For me...it drove me absolutely nuts! I went with the bumper swap...cause the SS kit wasn't out yet.
Good luck.
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Best 1/4: 10.97@122.09, 1.56 60ft w/4.0 V6
Best 1/4: 11.67@115.45, 1.64 60ft w/5.4 3V
Best 1/8: 7.401@92.77, 1.65 60ft w/5.4 3V
www.rygen.net/stang