Can't help you with a drawing, but the spec you need to make a drawing is SAE J499.
It's going to be a 1 3/8 6T spline with straight sides - pretty sure it's a 6B fit.
If you'd like to avoid trying to make, there's always Surplus Center: https://www.surpluscenter.com/sort.asp?catname=powerTrans&keyword=PSSS