I have an 05 g35 that I just purchased and it looks to me like at one point it had a front lip. On each side of the front bumper, about an inch or two from the bottom, there are "grooves" which look to me like they were used for mounting a lip. Is this true?

Also, I found an OEM lip on Craigslist ( http://longisland.craigslist.org/pts/2808129911.html ). Would this fit my 05 bumper without needing to make any holes? How does it attach? Thanks