Originally Posted by TZ_280SEL

The suspension part you asked about is not a leaf spring. It positions the front subframe. The subframe attaches to the car via mounts at the top. They provide the vertical positioning of the subframe. These two "leaf spring" looking things position the subframe front to back. They are held in place at the front by two bolts. One is a plain bolt, but the other is an eccentric in a slotted hole. By turning this eccentric, you move that side of the subframe front to back. This is used for the "course" adjustment for the caster settings for the front end. The fine adjust for caster is in an eccentric in the kingpin.