I have been following this thread with some interest since I have replaced two of these grilles in the past couple of months. I gave the old ones and the new replacement a good look and here is what I found. The older round headlight style and the new round headlight replacement appear to be identical in construction including the material thickness. The halogen headlight style is close but lacks an important re-enforcement on the bottom near where it bolts to the frame, and most of the ones of this style that are cracked are always cracked in that area.
