Pioneer 850010 rocker arm nut. Features Posi Lock design, 7/16-24in thread, steel construction, zinc oxide finish, ensures secure rocker arm attachment, sold as a set of 16.
Proform 66911C rocker arm set. Features 3/8in stud mount, 1.60 ratio, full roller, aluminum construction, blue anodized finish, fits Small Block Ford, set of 16.