Bob, I believe that is part of a bench seat. It screws to either the lower outside frame of the seat, or to the metal arm of the seat back , the arm that attaches the seat back to the lower seat on a two door hard top. Then the chrome seat molding (shell) screws to that bracket to hold the chrome seat shell. Check one of those bench seats you have, or take one of the chrome seat shells and fit it into the bottom of the seat shell to determine left or right. I am pretty sure that the bracket attaches to the metal arm of the seat back...