Not saying there right or wrong cause I don't know BUT, alloy shafts are a bit different than the old stockers, there is a lot of engineering that goes into them with regards to the shaft dia. as compared to the spline minor diameter.
I can't recall off the top of my head what superiors look like but they look "about" right. Maybe a bit smaller in the shaft portion but that also will be something that's determined by alloy.