Fifth Gen (LS) owners, I know many of us have been plagued with a cracking, disintegrating gray molding on our front bumpers. I have finally been able to track down a GM Part Number for the piece. 10178403. There are some out there (two on eBay) but they are pricey! Mine is very damaged, and I plan to try to get a replacement, after my hood repair is completed.

I hope this can help some of you!