67-68 to 69-72 Radiator Support

[BarryB]

What is the difference between the years ,to me they appear to be the same, but when you look it up to order a new one they specify the years different. The only thing I can think of that would make them different would be where the rock guard and center section of the grill bolts onto the support. They have the holes drilled in the bottom of the support for these items. Any know it alls out there that can answer my question