The 727 yoke is not the same as the A500 yoke.
The 727 yoke does fit the 518.
You can however look up the yoke for the Dakota with the 42RH and it uses the 7290 style U joint.
The 518 yoke does not work with a 727. You literally have to hammer it on. The spline count and diameter are the same. But the spline shape are wrong. They dont interchange. I've tried it and there are several threads that talk about it.