The one I bought was 49.625 and the cut length I ended up with is 52.525(ish). I don’t remember the exact cut length, but I have it written down somewhere.
Also, the drive shaft I was already running and had cut is a 3” diameter shaft, while the one I bought was 2.75” diameter. I don’t know if it makes that much of a difference, but I would think a larger diameter would provide more strength, no?