Id suggest if buying a part, get two, or three. If having someone repair it, see if they will fit a spare. I dont know how fitted the newer guns are, Iv heard they correct carry-up/timing by replacing the extractor star now. Smith used to make a variety of hand widths to easily correct or set up a gun, buit when ordering an oversize you never had any idea what size it was so far as I could tell. It was only after buying a parts lot with hands that I started measuring and realized they made them in about .0015-.002" increments across the spectrum of normal fitting range. Im not aware of anyone selling them by specific thickness, though that would be the easiest way (and I believe how the factory does it/did it) to correct them without a lot of unnecessary work.