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I found a few on there just now, choose 1973 Cadillac de ville 79 down, then mirror door.
I do see the 73 did have an option for remote control right mirror as seen on pages 14, 15 etc in this pdf option df3 it appears.
You are welcome to look through the 1971 here as well if you like, but there is no search function within the pdf which means that it takes time to search, https://www.gmheritagecenter.com/gm-heritage-archive/vehicle-information-kits.html