Front brake operating shaft question

[wrndln]

I bought a front brake operating shaft at a swap meet a couple years ago (top shaft in the picture below). I compared it to the other operating shafts I have and it is longer by 5/8". The standard model A shaft is shown below the shaft I bought at the swap meet. The longer shaft is the same diameter and the head is identical to a regular front shaft. I am wondering what the shaft fits. Is it an AA truck brake shaft? Any help identifying the shaft would be appreciated.
Rusty Nelson