So, since I needed to order parts for my pig as well, I ordered a new wiper arm and blade from Rock Auto. I had to fight more than a little with the insert that was still on the motor, but I managed to defeat it. Popped the new arm on, added the blade and bang, the rear wiper is back in business.
Why Chrysler went with a plastic arm is beyond me. Even they figured out it was a bad idea and switched back to metal for the 2010 model year.
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