The entire passenger side gutter is filled with silicone or body filler. So I take a look inside and find a ton of cloth type fabric. Left it alone for some other lifetime.
Here's the thing though, my dad never did work, and the previous owner never did any work...
...so that means all of that rust damage was done by at least the early 80's.....how can all of that happen in only 2X years? That's insane. Espcially since it appears to not have changed since it was "fixed".
Ehh, here in CA it'll last my lifetime so I'm leaving it alone.
Good luck getting yours back to new(or better!).