Up for auction is an NOS factory Ford belt tensioner for a 1979-84 Mustang for a 5.0. The Ford part # is D9ZZ-6B209-A and has been obsolete from Ford for a while. A buyer with reasonable expectations will be happy with this purchase. Please fee free cot contact us with any ?'s. D9ZZ-6B209-B,D9ZZ-6B209-C,E2ZZ-6B209-A