I have a 67 ragtop. There are two "L" shaped exhaust hangers, one for each side of the duals, right before the transverse mounted muffler. Each hanger has 2 bolts holding it to the chassis of the car. Now the problem - these bolts screw into what appears to be some kind of "blind" nut. My passenger side nuts are "boogered" up so that the nuts just spin, instead of letting the bolt thread into it. How do I get at these nuts!? I took out the back seat, also crawled into the trunk to try and see if I could find them, to get a wrench on them, so I could tighten. No luck so far. They are only hanging on by 1 thread or so, just enough to hold up the pipe, but are very loose, so they rattle constantly while driving. I know I can use an after market hanger, but I want to keep the stock exhaust look, not hack something together. Any ideas? Thanks.