Ok I believe I have your shaft, just dug through boxes.
I think the 325800 ds is 25" long, the distance from bottom of ds to round impeller pin hole is approx. 8 3/16", has 11 splines on bottom of drive shaft to engage pinion, and 4 spline on top, to engage crank. Should have a groove to accept o ring at top of drive shaft below crank splines.
There is another version I have as well, that has matching 11 splines to engage crank, all other dimensions are the same.
I do have both though.