I need ground effects for the front drivers side of my car, but can't find them anywhere! Any ideas on where I could buy them? (The second image is the other side)

 

Hawks, Classic Industries, eBay or the local junk yards.

 

Don't know why these pieces go missing/ break so often, but yeah, what Mikos said. I had both of mine pretty much explode on me just going down the road (a couple years apart), the OEM ones are pretty fragile. If you do go for the Hawk's ones, just keep in mind that you'll need to drill holes in 'em for the screws that hook 'em to the inside of your wheel well. The Hawk's pieces are solid though, both of mine have held up great the last few years with daily driving.... even survived getting crunched on a ramp when I was still figuring out ride height

 

It's because the OEM GM ones were made out of the same crap GM made their bumper fillers out of.