Hi CB, Yes these stem covers/protectors were standard equipment when using Borrani wire rims on any vehicle....Ferrari, Maserati, Lamborghini, ISO, and others....this had to do with the type of tubes available and wire wheels. These stem covers are quite visible in period photos. Stem covers were also used with cast Campagnolo and other brand wheels as well up thru 1969...then wheel casting improved, tubeless tires used.
Craig