On all S&W revolvers made today three parts have an identical "assembly number" inscribed on them. These are: the frame, the side plate, and the yoke.

These three parts are matched, fitted, and mated together very early in the manufacturing process. The number is there so the three parts do not become separated as they each proceed thru the various stages of manufacturing.

These three parts are literally "made" to go together. For this reason there is only a small chance a replacement yoke or side plate will mate up to an existing frame without some issues - cosmetic, functional or both. It's possible a new part might "drop-in", but it's more likely some fitting will be required.

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~ S&W aficionado in training ~