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A die that big would be pretty expensive and it's kind of a one time use item. You might try a thread file. You don't really need to know your thread size to use it, just match the file to your existing good threads. Amazon has them. This link explains it.
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Neat! Glad you got it repaired. Takes a little time and effort to shape threads with a thread file. Cool part of using that tool is that a few of the good threads will "guide" your file to keep everything straight.
I have used a "knife edge file" to shape threads when I didn't have a proper thread file. Axles are another place that kind of tool is really helpful...