Hello, after a year of working on the mechanicals on my 56 3100 w265 V8, now its time to start working on other areas. I bought new door hinge pins because it was obvious they were wore out. While unbolting the lower hinges on both sides the bolts just spun and would not come out. I ended up cutting through from under the cab in the wheel well to find that the cage that holds the nut was rusted out. Now I need to find parts to replace those and the holes I had to cut open to get to them. Any suggestion on where to get those caged nuts? Also what can I spray in those areas before patching the holes to stop the rust?