This exhaust manifold kit NOW includes the 4 sleeve nuts for the late manifolds and all the other grade 8 goodies required for mounting. Everyone forgets to order the sleeve nuts-geez! It also contains hardware for the exhaust flange to exhaust pipe connection. Look at your manifold and if it has 2 large holes then you need this kit.  Early 440 manifolds have raised cooling fins in the casting. So for the dual-holy manifold this is the kit.