Ferrari 400 rear mirror compatibility

Someone submitted these photo's of his 400 rear mirror. According to the owner this has been the Original mirror and not replaced before. If this is true then it appears they have been using a Volvo rear mirror. The part number is 1224135 and has been used on a Volvo P1800, 142 and 245.
I had it checked on the FChat forum and someone confirmed he had the same mirror. Amazing discoveries. I wonder why they did not choose a Fiat 130 mirror or such ...
I will update the compatibility blog as well.