I think I have a BIG problem

[767Jockey]

I disassembled the whole front suspension on my Contemporary. I glass beaded everything, powder coated, and bought all new polyurethane bushings, Grade 8 hardware, etc. Now I'm hosed. I went to mount the upper A arm to the car, and one of the nuts that are permanently mounted inside the frame to accept the A arm mounting bolt broke loose inside the frame rail. The nut is stuck on the end of the bolt. I can't get the bolt out of it because it's just spinning inside the frame. Even once I do, all I'll have is a hole in the frame with no nut behind it. I'm so darned dejected right now, I can't believe this has happened. I have no idea what to do. I have no way of getting inside the frame to mount a new nut back there, as this part of the frame is completely inaccessable as far as getting to the inside. I can't use some sort of rivet nut because this is the main mounting point for the upper A arm and it has to be REALLY strong - the whole front suspension counts on this for strength. What in the world do I do now?