Someone busted off the rear wiper arm of my 2005 Legacy Outback. I called Subaru parts department and got a replacement, part# 86532AG09C. After finally removing the stuck plastic on the old one, this new one won't fit. There is a metal nut with teeth on the bolt, the plastic was stuck to it when I took the old one off. When I go to put the new one on, the bolt doesn't stick out far enough to thread the nut on to hold it in place. That metal piece with teeth is in the way. I know that piece is important to catch the plastic but the new arm's plastic is too thick. I called Subaru and they confirmed that it is the correct wiper arm and I don't really want to take it in and pay someone for something so small. Any help would be greatly appreciated. It's snowing and my teenage daughter is driving the car.