I’ve been trying to remove the rear fender off a 34 fordor sedan. I was able to get some of the bolts out but some of them are stuck because the cage nuts are broken. The ones I’m having issue with are on the top and forward part of the wheel well under a channel where the door meets up with. The cage nuts seem completely surrounded by sheet metal and structure. What is the best way to get to the cage nuts? I appreciate any help.