Piece of cake! I drilled out the dowel pin, pushed the original bushing out the front, filed sharp edges off the drive shaft splines to prevent cutting the new seal, cleaned-up the inside front end of the torque tube, and tapped in the new Okie Bushing. No problems. The whole job took 2 or 3 hours.
I still need to replace the dowel pin, but I'm not sure what to use. Can I tap it and thread in a set screw, or hammer in a short piece of all-thread, or.... what???