In that 22.2mm is the standard (commonly called 1" - which it is not - any more than a .38 caliber revolver is actually .38 of an inch (it's .357 or 9mm)) So before you go hunting for these - by someone who can't measure - 21.15mm stems - get the calipers and check again. Then check other quills as well. I'll bet you it's the same as the 1" is the same as the 22.2mm.