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 inches wide. Not only does this larger shroud greatly enhance cooling capabilities, but 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. Radiator shroud brackets are sold separately.