It would be fun to be sure, just to lock down (one of these questions that never really need to be answered, just filling the hole goes far enough but what I see for the Daytona is that the tabs are at 12:00 and 6:00, where for the Goose they are at 3:00 and 9:00 (with the 4 supports oriented vertically and the smaller ribs horizontal). I even looked at Autobianchi just now, they look like the Fiat pieces...But couldn't find a good picture of the Montreal.
Probably just one of those details that is best left forgotten #6500-357, Complessivo bocchetta sbrinatrice"