when in doubt go to small, i think its 1/8th or 1/4th i belive it comes with instructions and hard ware (or should) the key is get a friend to help hold it up, even it off side to side, dont just line it up on one side else the other will have a larger gap, you can pull it back off the front edge to line it up on the sides ( go all the way back ) or you can sacrifice a quarter inch perside~ and have it line up on the outer edge of the bumper (what i would do) just make SURE it doesnt stick out past the bumper....
2003 Cobra Vert (Redfire) #3938 of 5082 @ 05/27/2003
472rwhp/493rwtq -Modification List
- Dyno Sheet
2012 Mustang 3.7L M6 (Kona Blue)
2011 Ford Edge Sport (Red Metallic)