rear view mirror mounting

Hi All! I'm looking for a dash mirror mounting bracket ring to a 1964 Alfa 2600 Spider dash to install the mirror. Anyone have a spare for sale, or at least one I can borrow to fabricate another? Please help! Any information finding a part like this would be incredible. I'm looking for this...

A while back there was a discussion about cleaning the rear view mirror. there was concern as to how it was mounted. Take a look at this Ebay item. It shows the mounting. I'm not saying that this one is for you only saying this is how it is mounted. I have no connection to the item...