This listing is for a brand-new set of stock rocker arm kit compatible with 1965-1968 Ford Mercury 289 302. Set comes with 16 rockers, grooved style balls and nuts, 16 Pushrods and 16 Lifters. 
 These are compatible replacements for 
Push Rods are 5/16" diameter X 6.804" Over-all length. Please confirm!
Hydraulic Flat Tappet Lifters.
Rocker Arms include Nuts for either 5/16" or 3/8" head studs. 
After 10/4/65 change