I'm not a body man so when I find cabs rusted above the windshield I find a replacement cab, as that's cheaper in the long run than taking the roof off to make that repair. I'm guessing there is the normal lower rust to deal with as well, right?
Here's the panel you need to do the interior roof repair...
https://www.classicparts.com/1955-59-Roof-Panel-Skin-Inner/productinfo/44-008B/ This one piece puts you at half the cost of a good solid cab.
Mike B
