It is not often that I would question Vic's modifications to a Vincent motorcycle, but surely welding additional brackets to the UFM is totally unnecessary, the standard rear tank bracket will take all weight you will ever ask of it, when full of fuel and with a heavy tank bag on top. The only purpose of the T38 and T39 tube and stud is to stop the rearward tank panels from flexing, with vibration and the like, and then fracturing the tank , as was found on the early models. As Bruce has alluded to, this not a precision component, neither does it need to be, you can shorten it, lengthen it with a washer if you previously cut it to short, you can file two grooves in it so it clears the underside of the UFM, you can file a small angled lead on each end to assist fitting, it only has to be a slide fit between the existing tank tabs, none of this is in anyway difficult or challenging, I would even suggest that if you find it so, perhaps a Vincent is not the bike for you.