Ferrari hose kits from Dave Helms

Dave Helms is putting together some hose kits for 400i's and he needs to know the i.d. of the bottom tank hose(s) (#20 tav 9 in the parts manual)that feeds the coupling area. Any and all help will be very much appreciated. Dave is one of the great tech contributors on F-chat as most of you already know. He's hoping that the magic number for this hose is 35mm i.d. He's at Scuderia Rampante @ aol.com. I.d bet dollars to doughnuts that Brettski knows this one. Thank you all very much. Jacques.