http://www.boltdepot.com/Catalog.asp..._id=bd&type=SN
I've run into the same problem with aftermarket stocks occasionally.
I ordered a box full of assorted sizes to give me a lifetime supply ;D
I'll grind the length down to fit. I ordered a few nuts also to help chase the threads after grinding.
Found its not really necessary but it does'nt hurt.
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