Is there a difference between the A/C and Non A/C windshield defroster vents on a 73?

[Heywodja]

Looking for info on the front defroster vents..

 

[EV2RTSE]

The same ones were used from 70-74 so year doesn't matter, but yes they are different between a/c and non a/c. If you go on ebay you can probably search the listings and see the difference.