Original had 1 or 2 extra leaves depending on applications, I am not familiar with Hotchkis. Being said for all the time it takes if your going to swap side to side. lay them out beside your old springs and measure them up. You may see a difference on the floor. If not slide them back in and see how they fit. To me it sounds like something simple. I would compare center pin location with the old springs and make sure(double check) its located on the axle properly