47-59 How to fix rear cab seam??

[smoknbarrels]

So I have done numerous patch jobs, rocker panels, cab corners and so forth… but that seam just under the rear window, bolting the top and bottom of the cab together is completely rusted through, the whole width of the cab!
Is there an easy fix to this? Or do I need to replace those massive roof and back panels? Seems expensive and excessive doing it that way?
Seems a lot of these trucks have rust pouring out of that joint.
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