I am looking for a 1st/2nd gear Shifter Shaft (GM part 3831709) for my 1965 Muncie M20. I stupidly broke the stud while trying to replace the shifter bushings while in my car. Now the transmission is out of the car, I would like to replace the shifter shaft. My side case has the number 3831707 on it. Been trying to find one of these for a month with no luck.

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Thanks in advance.