Input shaft help

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Can someone identify this input shaft? Had my trans guy refresh a “built” trans I bought. He said there was a billet forward drum and overdrive carrier in it but he thinks it’s a stock input shaft. Looking at the pic, the splines seem a bit longer and a different undercut on the shaft we pulled out over a stock one. Any idea on what I have ?
Thx fir any help.

 

[mikestertwo]

Looks like a stock shaft

 

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Could it possibly be the newer upgraded stock shaft that I read about?