It depends, which is not what you wanted to hear. You really need an ejector star with ratchet pads from a 27(no dash) or a pre-27 because you need the right hand threads so you can use your large head ejector rod.
Fitting will probably be required and you will have to drill the ejector star or the cylinder itself for the locator pins. Their location moved sometime after WWII (don't remember when). You might consider getting a whole cylinder assembly, fitting it and using it when you wish to shoot the revolver.
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S&WCA 1729
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