Are 1973 Cab corners unique and different from all the other years?

[jlmerie]

When I was removing these cab corners from a 1973 Cheyenne Super truck at the junk yard it quickly became obvious to me these cab corners are different than any others I remember removing. I am including some pictures of these 1973 cab corners next to some later ones. Am I the only one that did not know this cab corner configuration existed?