I had to open mine up to check. I didn't even realize those things were there.
If S&W can't help you, I don't have an answer. I suppose you could try giving Brownell's a call. If anyone outside of S&W is going to have them, I would think it would be them. If they don't have them, they might be able to direct you to who might.
Out of curiosity, what happened to the ones that came with the rifle that you are looking for replacements?
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