I have the R-Specs and had to cut out my rear fenders to fit my 19s. The R-specs had to also be shaved down to fit the contour of the shaved lip. The R-Specs get screwed into the lower section of the wheel well using mostly factor mount points. I did drill two more holes along the wheel well just for extra support. I used very small screws that would just fit in the remaining wheel well lip. also included in the kit is 3m body molding tape that holds great. Same stuff that comes with the L-Tuned kit to hold on those panels. I haven't had any problems and its been on for about a month now. E-mail me if you want some pics or if someone wants to host some pics with this thread I can send them to you.