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What about the cable attached to the backside of the mirror?
Sorry, I had a brain fart when you said non power mirrors. I forgot about the cable. Yes you do need to remove the drivers side panel.
Since there was no such thing as a power mirror in 73 I would have assumed he has the non-remote mirror which doesn't have a cable, just the two screws... So I don't really consider your post a brain fart or ever cerebral flatulence, more like a poorly worded question...