John, I don't understand what it is that you are looking for. All Leslie S-5T type horns had the same bells. The full orifice horn would sound a lot louder or possibly more harsh, but the notes from each bell should be the same as any other horn of this type. The bells and manifold are the same castings for any variety of S-5T. The only difference between an S-5T and an S-5T-F is the size of the opening in the internal orifice dowel pins.