Tapered/beveled headlight assemblies and rolled under hood edges with no small crush triangles on the bottom structure of the hood (at the front). This was a Mustang detail during the time of the beginning of assembly, up through about late April with the hood type, which around that time changed to the typical '64.5' turned out edges version. The headlight assemblies were the same from the beginning of production to around mid-September '64 or so.