This is a high-quality carburetor diaphragm for a 1977 or 1978 Ford Mustang II. It is an OEM part with the manufacturer part number D7ZZ-9A900-A. This vintage part is perfect for collectors or those looking to restore their Mustang to its original state. The oem box shown in the photos will not be included in the sale. What you will recieve is the piece of the box with the part number as shown in the last photo.