1960-69  Rocker Arm Nuts, set of 12 . I would recommend  to  replace all 12 if you have to change several.  Don't forget , after many years of wear & tear, they can come loose by themselves. So replace them all   .for those on a budget, we also carry used push rods, used rocker arms, don't hesitate to give us a call at 918-753-2486, or e-mail rafee@rafeecorvair.com, we will gladly help you out.