66 seat rail return spring

[Chevystep]

Just put the newly upholstered bench back in the 66 with a question....Was there ever a passenger side seat rail return spring? Has anyone put one in? Never found a frame rail hole like the drivers side for one, but the passenger side of the bench does tend to be “a little behind” the location of the drivers side, usually a whack of the seat back sets it in the last notch anyway.....