Not sure if this detail transferred to the CMP's down under, but here in Canada, the side mirror mountings are also different between Ford and Chevrolet. Ford mirror assemblies were mounted directly to the cab, just below and forward of the upper door hinge. As a result, the door could sometimes swing completely forward and knock the mirror out of alignment.
On the Chevrolet, the mirror assembly was mounted directly to the upper door hinge, so that the mirror moved with the door.
David
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