My front splitter is toast, pulled hard on the freeway to change a few lanes and the splitter sagged, with only the outside bolts still holding on. The problem is, the bolt holes into the bumper are cracked, so not sure how I will fit the new splitter on? big washer or ? Any ideas.....?

 

I assume the cracks are on the car side of the mount? Pictures might help us here.

 

I am trying to remember if the speed nuts are on the bumper or the under radiator air deflector.
You can use Fibrex, it is actually a plastic repair that is almost like using plastic welding rod with a Soldering Iron not gun

You can also 2 part epoxy the cracks in the bumper and then get some thin fender style washers to go in between the bumper and the splitter and then stay away from curbs and speed bumps. There really is a good reason to why I back into parking spots