Dear Doug,
A couple of decades ago, I had some Vitaloni mirrors, but I can't remember if they were involved with this tale of rear view mirror modification.
I was at the glass shop having the Pantera windshield replaced and I asked the glass-mirror expert if they could change the mirror in the passenger side mirror from standard mirror to a wide angle modern mirror for improved rear right side coverage. He told me it was no problem.
When I picked up the Pantera the windshield was done and so was the mirror upgrade. IIRC, the cost was reasonable.
So, you might try some of the local glass shops and see if one of them might be accomodating to repair your Vitaloni. I do believe that it is likely.
Warmest regards, Chuck Engles