Peter,
I've also seen the stock mirrors mounted on the side of the door, rather than on the top ledge. I think they look better mounted on top. They flow with the body lines better, and don't look 'tacked on'.
I can't imagine why the factory would change that. Maybe it was a trend at some time.
My '86 5-S #9434, has the stock mirrors mounted on the doors top ledge.
Michael
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