Just an FYI for posterity;
I'm 90% sure Auveco 11288 is the correct clip for the S.S. side trim with black vinyl insert along the length of the car at lock cyl. level. Probably same for '73 and '75. These are the GRAY plastic clips with fairly wide scuff wings along the body contact area. For some reason I had to re-learn this info because I didn't remember where the used grey clips I had came from.
I'll chime back in when I'm 100% sure.
I'm 100% sure if I CAN confirm this, it will be almost the only place in the world anyone without some kind of expensive magic parts archive will be able to find this out because Auveco does not identify their parts with applications nor does the 1974 Assembly manual cover this (as far as I know).