This fan shroud is for the 1964-1966 8 cylinder Mustangs and is extremely efficient in drawing in cool air through the radiator at low speeds and idle, which is when most overheating occurs. This shroud is 3 1/2? wide. Not only does this larger shroud greatly enhance cooling capabilities, it also offers more protection from the fan blades. ?Caution Fan? decal is also included. Made of fiberglass. 1964 - 1966 6 cylinder Mustangs can use this shroud with minor trimming, especially on 6 cylinder cars equipped with power steering and air conditioning. Note: Radiator shroud brackets sold separately.