Convertible brace
That is what I though too, however my "Performance Shop" who I have used for many mod's on my car, told me that some models of the 2015+ Mustang Convertibles do NOT have the brace .... thus I thought I would reach out to everyone and ask what they have.
I think this weekend...
Does your's have an OME one? If not, can you let me know your year, and option package? I've been told not all 2015 and up convertible have the factory rear subframe brace.
I used iso alcohol and the 3m tape adhesion accelerator then stuck them in place - waited a day to drive again and they have been on for over 4K mile and seen triple digit speeds ... good luck and enjoy the new look