Buy a machined recoil lug from Sharpshooter Supply or from Northland Shooters Supply. They both already have the "pin" in it so no need to worry about that, and cost around $28-30.
You wont need to taper it to fit it in a duramax either. In fact, if there was an issue you'd be better off to clearance the stock instead. Best bet would be to grind back on the recoil lug area of the stock and do a Lug Bedding job on it.
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