theres two ways to fit these dont forget, some align the sides up to the black drop off plates that come from the arches, i personally cut mine so that it fitted flush to the curve in the side of the bumper, looks far more OEM.... just have to sit there slicing the splitter like a potato peeler with the stanley to get the right angle..... i drilled some guide holes when fitting mine, then also fitted two longer screws with big washers to make the two middle struts sit securely
have found over time though that thick tapping screws are far better than the thin ones, have replaced mine so many times from the splitter getting caught on garage ramps