I have been unable to find a u-joint that matches the splines on the rack. I emailed Alex and he said to use an unsplined connection with a set screw. That is what I have in the photo above. So, I am going to leave things as-is unless a problem develops.
I have two Super Beetle bushings and I installed the tighter one. After driving the car I think maybe I should have used the looser one. There is a little resistance to turning the steering wheel. I hope it will wear a little and free up.