No. The early Darts have a "tab" that's bent up to support the bottom of the bow in the photo I posted. the sides and bottom of that square cutout are slices then it's bent up to support the inserted bow.
It's only sheet metal though, so one of mine bent back down, allowing the bow to sink during headliner installation. Now I've got to weld or rivet in a piece of angle iron to get that ledge back. I was just wondering if anyone else had this happen to them. Totally fixable, but a pain none-the-less.