I have an 89 runner. The rear window would not roll up. I heard a pop and then it was really broken. I took the panel off and discovered that the arm that raises and lowers the window was broken. I guess my question is, can this be fixed by simply replacing that arm, or do I have to get a new mechanism? Also, I guess I need to find one of whatever it is that I need. If you have one that I could get ahold of, please let me know.