[Latitude 28]

Update to my last update; I found a P/N 422628001 on Ebay....$39 plus shipping.  It is an International NOS part with the original box.  Inside the box is a sealed bag with a tag identifying it as P/N # 3397000095.  Ok now I am curious, the other part I Ebay'd was P/N # 3397000095.... it had a smaller taper or so I thought.  It matched identically to the International P/N 422628001.  So wait for it....both of them are installed on the coach and work perfectly:-)  When I actually torqued the wiper arm down on the tapered spline there is positive engagement of the splines.