1960-69 manifold stud and nut set, heavy duty. You will need 2 studs and 2 nuts per manifold. Alright, there it is, now you can replace your worn-out studs with these heavy duty ones, and avoid leaky exhaust. If you have any questions about this item, don't hesitate to call Rafee at the shop at 918-413-1548. Why pay more elsewhere for the same quality item? Get equal or better quality and more for your money at Rafee Corvair.