While driving on the highway at night, I noticed a tire on the road too late, and couldn't avoid it completely. When I got home, looked at the front bumper and it stripped the screws off the right side of the splitter. I went to lowes and got replacement screws, screwed on what I could. The problem is that when the tire stripped the screws off the bumper, it tore the drilled holes open a little too much for the replacement screws to secure the splitter well.

There isn't any thread on this. So I was wondering does anyone know how some kind of compound that I could fill the front bumper holes with? Then, drill holes onto that compound because I really do not want to make another set of holes on my bumper.

 

A washer maybe with a nut.

 

I use the same splitter without buckles for 2 years - no problems at all...
Anyway, my suggestions:
- change the points of mounting - as I recall the buckles are adjustible so you can easely put em few cm higher or lower
- let the buckles go - you'll never notice any changes except the cleaner look)))
In both cases you'll have to mask the holes - but this is just a cosmetical procedure...