72 later Mopar marker lights

Weren’t these used from 73 to 76 on the A bodies? Curious what the significance of being late 72 is? Date code? I know they were on other Chryslers until the early 1990’s.
They are the same on 72 a , b , an e bodies an many mopars , as well as the 73 an up to whatever year , the first year was 72 when these started , now these are new so unsure if they are date coded or not with out looking closer