Side mirrors for 6C 2500SS Touring coupe

I am restoring a 1948 Alfa Romeo 6C 2500SS Touring coupe #915630. Due to the beautiful closed body lines I am expecting this car to be very difficult to drive without the use of rear view mirrors on each side of the car. I realize that these cars apparently were never supplied with outside mirrors by the factory.

I have been looking for period correct accessory mirrors made in Italy or France that would be correct for the age and history of this car. So far I have found nothing.

Does anyone have a suggestion where I could find some suitable mirrors for this car? I am trying to keep it as original as possible, and anything non-original has to look like it came with the car or was added by the first owner. I have found lots of British and American replica mirrors but they just don't look right on this car. It spent most of its life in Italy and in France.

I would mount the side mirrors on the heavy aluminum frame around the door windows. The mounting would have to be bolts into tapped holes in the window frame.