The brackets are for the trunk,at least thats how my kit came. Install them after the arched aluminum trunk piece is installed. They attach to the trunk hinge with one nut (short leg). The long leg runs down to the trunk cross brace, drill through the cross brace and bracket, and bolt them together. The bracket goes on the back side of the brace, they may need trimmed at the bottom. These also add support to that area of the body.
Ron