I pulled the rear and springs from my 73 charger and was cleaning up the front hangers when I noticed that they are not the same. One is shorter than the other an when I measure the distance from the mounting surface to the center of the bolt hole, one is 2 3/4" the other is 2 1/4". Is this by design and there is a right and left hanger or did someone before me replace one with the wrong on?