Hello, we are looking for a replacement part to install the liner in our pool. Not quite sure what it is called but maybe a rail? It is a resin made section that holds the liner in-not to be confused with the bead lock. May be called a bead receiver? See attachment. This is all we have between us and a nice cool summer in the pool. The pool was installed sometime around 1975? And we are unable to find pieces locally. Can anyone help?