I have a problem with the rear shackles,seems the leaf springs are rubbing the frame rails causing some noise. I replaced the leaf springs and all bushings but i used the shackles (with new bushings) when i restored the car.I think the shackles are not the originals and may have been homemade. Anyone else had a problem like this,does anyone know what the length of the shackle is from center to center? thanks allen