Is the bolt and spring in the front locking lug the same size for all frames ?

I believe so Jimmy.

It's a little confusing....by my S&W parts book it looks like some J frame and K frame bolts are the same. Some J frame models are a different number. K frames without ejector shroud have different bolts for 2" barrels. N frame bolts are different numbers than K or J frame.
The springs are all the same number for J, K and N.
Sorry, not much help;
Mike

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Mike
S&WCA #2470

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Ret. LE, FA Instr, S&W Armorer