Try our new info resource - "Aladdin's Cave" (Main menu)Just added a separate link to Ash's Dropbox thread (shortcut)
OK, found your problem. I took a 5.5mm petcock and the large part of the nipple is 6.95mm the petcock for your bike measure 6mm so you have a 1mm difference which looks like your hose is suppose to be 4.5mm which your clamps will work on.
The 5.5 viton hose i bought in UK is a tight fit on the carb and petcock nipples. Tell me how long you need and i will post you some at cost, i also have a box of various size clipes so would put those in as well