im suprised no one said this..
those wont work with Ranger leaf springs and hangers.
This is a ranger lifting shackle
notice its open on one end and tube at the other? Thats because it mounts on a hanger that requires a tube cross section.
I know my explorer shackles are similar to the universal, and Id assume those "muscle cars" are the same. But thats because theres no rear Hangers, it mounts on the frame itself