2 mating surfaces are a couple... threes a serious pain. Most of this factory grille piece is hidden behind bumper, needs to get done though. I made a new right side return shaped to the inner fender and drilled holes for factory mounts. Needs to be removable for access to bumper bolts. This new return had to stay out of the joint, but slide behind the valance mount tab, extend to both mounting points and weld to the thin corner horizontal right corner of the filler piece. The filler piece dead ends at a bumper bracket. Lots of staring occurred during this one.