The correct size is 96.5 cmFor a '67 Duetto, I need one Air Intake Hose Securing Clamp (the large clamp that holds the flexible hose in place between the Air Filter and the Air Intake.
Plausible explanation. Every original Duetto, Super, GTV that I have encountered had the clamp style. USA owners and mechanics were more accustomed to the screw style and may have changed them out because they believed them more reliable. Keeping in mind that in the 70's and 80's originality was not a concern. Alfa's were many years away from being desireableIt seems that Alfa used either the screw RomaBlok or clamp-style interchangeably through the corssover tube life.