I built the backhalf on Bobby's truck and asked him about the cage. He said BTF did the install, and I think he said it was an early cage that needed some work to get fitting properly. I'm not sure if they've since made adjustments, but it was a few years ago when I talked to him about it.
That said, I have installed a Solo cage in a bronco years ago and the instructions were terrible. I didn't do a great job (basically working alone for the whole thing) getting it fit in and squared up, so I ended up having to grind stuff to make fit and redo a couple small tubes. However, I welded a Solo cage that
@the_fablab_ fit and tacked in place, and it was much better.