Hi all.
Happy new year to you, one and all

I had the rear wiper fail on my 2005 Grand Cherokee (WK)? and I bought a good used motor and replaced it. I now have a working motor but...... The drive shaft that pokes out of the tailgate is about half the diameter of the original one and instead of being a circular grippy fitting it is a tapered spline fitting.
So my question to you all is: How do I resolve this problem? Do I need to get a new wiper arm? If so any suggestions of where to get it?
Thanks in advance
Keith
