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....
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2003 REDFIRE COBRA #3938 of 5082 @ 05/27/2003 1 of 414
MGW Shifter, Stingers, JLT, SS Inserts, MM FLSFC & CC Plates, SS Lines, H&R Race springs, IRS Brace, MRT Hood Struts
ME.com Member #29 - 400rwhp/380rwtq