71 duster front end help

This car only has 20,000 miles on it and from the looks of things the steering wheel has never been off. So from what i can see there is no master spline on the steering wheel itself. I see what your saying about the coupler. I was very cautious when i assembled it all to watch for master splines on everything. The coupler is facing master spline up with dowel pin hole to the top as well.