I have been manufacturing these fans for over 5 years now in both steel and aluminum to fit all bolt patterns wide 5, 5 bolt and 4 bolt. The steel ones are $35 each and the aluminum ones are $50 each and the lightest on the market. They are so much better than an inline fan that only rates for 250 cfm these fans with a wheel speed of 100 mph pull over 1000 cfm. So they are more effective and inexpensive than inline fans. If you need more information please contact me! I ship all over North America.