Hey Matt: went thru the same thing on the 300SD. The right rear window crumbled the 0.50 piece of plastic. Dick over at the www.benzbin.com
sent me one for about a dollar or two. I had to get a motor dremel tool to grind out the pin and use a #6(?) screw and lock tight to replace the plastic piece and attech it to the arm. A lot easier than Dodge and Ford!