I was in a fender bender a while back and my front headlights were cracked is the a way you can just get the main plastic piece for the headlights???

 

I've never seen it. You can find the whole headlight for 100$ or less on ebay. If you find a good deal, both of them for ~ 150$.

You could probably find the said piece if you looked and asked around hard enough, but it would most likely end up costing you as much as the whole thing.