The main cross grill stamping making up the 1967-1972 GMC grilles may at first appear the same but they definitely are not.
The more noticeable difference is the large GMC letters stamped in the center of the 1967 grille (one year only). Therefore, these three letters are not placed on the hood front as during 1968-1972. Between 1967-1970, the vertical center bar (3″ x 10″) is slightly raised above the outer edges.
This vertical center bar on the 1971-1972 GMC grille is slightly depressed between its outer edges. This depression is painted satin black. At a distance, it gives the appearance of a split grille with two equal halves.