Update & correction, there are only 18 "cage" nuts on the rear fenders. In the process of removing the fenders I did break off 17 bolts. On the left side three cage nuts are completely rusted out. I was able to remove 7 bolts with using this method, I took a 1/4" steel rod and grind the end to a pencil point. I was able to weld the tip to frozen bolt. The remaining bolts are to recessed to reach, so I'm going to try and drill them out. Maybe this will help someone else, just hang in there, and keep working at it!
