Leaf spring nut. Left. Right. A solid metal or plastic block with a threaded hole in the center which is used to tighten or adjust the Suspension Leaf Spring. Leaf Spring Shackle Nut. Mounting nut for Suspension Shock Absorber. Nut for the Engine Mount. lock. Engine Mount. HEX FLANGE. Leaf Spring Shackle. Side mount retainer. Strut ASSEMBLY. Suspension Absorber. U - bolt.