Factory MoonRoof Parts??

My '75 dart has the factory moonroof, but it doesn't work. I removed the entire assembly so that I could troubleshoot it. It appears the springs are kinked and will not pass through the hand crank mechanism. I have faith I can fix it if I can get replacement parts.

Does anyone know where I can get parts for these things?

I have a specialty shop that said they can repair it, but they want $75 just to look at it. Plus I'd prefer to do it myself so that I can do all the bodywork on the panel before the new weather stripping and such goes on.