The 1971-73 Mustang/Boss 351 Ram-Air Air Cleaner Assembly with Hood Seal is a vintage and performance-driven part designed by Ford. Made of steel with a blue color, this round air filter housing is a reconditioned piece crafted in the United States. With its authentic manufacturer part number D1ZZ 9600 C, this air cleaner assembly is a perfect fit for classic Mustang and Boss 351 enthusiasts looking to enhance the air and fuel delivery system of their vehicles.