Here is a new part that we have had lots of calls on over the years. It is the spring that goes in the lower radiator hose. Originally, Mustangs were equipped with these to prevent the lower hose from collapsing when the water is sucked back into the engine from the radiator. None of the new hose sets purchased today have this spring. It is made of stainless steel so it will not rust.
We have these for Small Block (EG4761) and Big Block (EG4762) Applications.