Completely different mirror head size and shape too, not just the base. Even mirror glass is a fraction larger and different shape on these models to F-body. The one occasion where they could have used the same part or been far more different. Although that issue still exists even on F-bodies due to incorrect gaskets used and reproduction parts claiming to cover all bases which were not even the same to start with. The original gaskets had a taper and a locating pin. If you found a couple you could flip them over and remove the pin. Or flip over the existing gasket, already looks bottom heavy affecting the angle.
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