whoops! auction clearly states the nipples are threaded "3/16ths BSF (CG!)" i think from the wording of the listing - "they will fit Bottom Bracket Shells and Head-Tubes where they have been previously threaded" they will thread in to the existing hole but that is not the original threading. i got 2BA from somwhere -so maybe this is the original thread?
simon bird
london
england.