20H Heavy Duty Crank - same dimensional crank as a stock or popper 20H.  This is not a perfect crank, however, it is still a very usable part. The flywheel taper on the crank is a bit rough but it does seat into a flywheel taper. A good new flywheel key and it should be just fine. Journals all look good. Bearing surfaces look good. Driveshaft spline is fine.