When a friend of ours needed to replace his Powerstroke exhaust manifolds, we worked with him to make sure he had the right hardware for the application. As a result, we know exactly what the job requires, and we offer them as a kit consisting of eight stainless steel hex head bolts and stainless steel flat washers. The 7.3 is known for it's durability and longevity, so it makes sense to use hardware that will not rust instead of the overpriced OEM steel hardware. These are not identical to Ford part# F4TZ-9S425-A, but they are a proven, (and we think, superior) substitute. F4TZ-9S425-A