I haven't seen one that wasn't at least a little rusted on the ends. I'm not sure why there is such a large recessed area at the ends either. I found the rust started and spread from a single screw hole they put there. Weld a patch in it is my plan.
that's where they put the padding for the convertible top so it doesn't show a lump in the top. of course it collects any and every bit of water that get's blown in from a weak seal and rust's out. the header seal channel and 2 side pieces that hold the top down are rust catchers also. mine will be redone in ABS plastic to stop the channel from rusting again as soon as I can get a mold made of a decent part.