If there is a difference its only cosmetic, even then I thought 67 was one year-GMC in center,68-72 all the same. There may be a slight diff in side grille trim styling from 68-70 & 71-72.I know for a fact 68-72 GMC uses same fender, also same as 68 only Chev fender. Core support on GMC is unique, same as 67-68 Chev but with dual headlite bucket brackets welded on. Pretty much all same truck other than the minor sheetmetal/trim differences during the years. 72 doors are unique, diff trim panels. Brian
