These are bucket seat mounting brackets. There are 4 pieces The wide pieces go on the outside closes to the rocker panel. The skinner pieces labeled left and right go to the inner closest to the transmission tunnel. The floor pan should have an indention of where they should go. The outer pieces fit a bench or bucket seats the inner pieces only fit bucket seats. To install you may want to put brackets on seat frame the set seats in the car for alignment the tack well. Then pull seat out and weld.
