Some cars use a bent
that measures 3/4" x 3/4", and wraps around the
seat back. If the sheet metal on your car has a lip, the tack strip
sits on it.
Some cars use a
it is several pieces of wood that measures 3/4" x 2", It is cut to fit
bolted to the inside of the seat back, protruding above the top of the seat
back. Belt rail sheet metal doesn't have a lip.