Oh yeah, the way your Trektop has started to relax and pull out of the header bar looks very familiar! I thought the same thing as you with the metal braced replacement header and actually tried that part off of a junk soft top that I purchased. I can tell you that I did not spend long messing with it but the header bar will not directly bolt into place on the Bestop Trektop NX side bars. The factory style header bar is much thinner (front of jeep to back) as well. For clarification, my broken bar would actually feel as if it was "clamping" correctly in place. The only signs of issues were the apparent gap noted in my pictures and the additional wind noise. If you are getting that big of a gap and your header bar is clamping into the factory holds, I would suggest that it is time to at very least take apart your header bar and look for broken plastic pieces. It takes all of 5 minutes to remove the header bar and check things out. You might be able to flip your top back and reach your hand between the fabric and topside of your header bar to feel for screws that are not seated all the way or are somewhat loose.