This is the second one of these that I have purchased. In both cases a note was included in the kit that states that some of the fasteners will vary in length due to different designs by Ford. ARP was happy to exchange the valve cover bolts in both instances for me at their Ventura, Ca. location. I suppose if you don't live near here you'll have to mail the sizes that are incorrect to ARP. I know you will have to exchange the valve cover bolts because they are too short even for the stock valve covers.