The grille on my '71 is missing the lower filler which is normally attached to the grille. There is no sign og the grille being broken or cut. Is ther an additional piece available?

71 Chevelles don't have filler panels. The filler piece is molded into the grill. It doesn't come off. It's part of the grill. The grill actually curves up to, and under the bumper. The headlight castings, left and right, have a similar piece molded into them, which completes the "filler panel"

BTW: All 3 sections should be body color....