Pic of some of my grips . Counting top left to bottom right, top row 1-3 are damaged sets so don't look at those. second row left is #4, early light walnuts. Third row are squashed eagles with blued screw and eschuseons which are late OM, early NM and I don't think those made it to 1976. Last (right) in second row, first left fourth row might be the ones you want. Let me know.. I can pm individual pic of a set to you for closer inspection….
Others chime in as to which set would be right for a 1976 gun…