LG Motorsports LG C6 Carbon ZR1 Splitter - Manual (Page 7)

Now that the support is bolted to the splitter you need to mark the three holes onto the
rubber part on the car for the final attachment.
Figure 9: Drilling holes into vertical support
Again, bolt these just like you did on the top side, with the small washer between the bolt
and the metal, and the large washer on the back side between the rubber and nut.
Figure 10: Installing hardware.