I had this cylinder bored for 45acp and somehow I traded or sold the gun. It is 1.96 from star to boss. It would fit in the Vaquero I just sold, but would not turn. It fit fine in my SBH, but the only NMBH I have left is an early one with recessed cylinder. $110
Looks like boss to star 1.961
Star to front of cylinder 1.862