It is the vinyl top, man...I really hate what they do to these cars. They trap condensation, get rotten, crack, allow water to get in and then the rust begins. Once the rear window allows water through, the trunk rusts out.
I started making patches for the right side.
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The bottom flange was too narrow for my liking so I made another patch.
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This one extends down past the corner. It also wraps out of the channel and into the buttress/sail panel.
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The metal in this patch is slightly thicker than the car's sheet metal or maybe it just feels that way because it is new.
The edges had to be sliced to allow me to bend and conform to the desired shape.
I don't claim to be an expert on this. I've patched lower quarters, floors, taillight panels and such but these compound curves are new to me.