I replaced all the matting inside mine last year. Just like the original when I bought the car new, the top center of the vertical bulkhead mat has a flap cut to fit around an angled steel brace. And just like the original, it's now hanging upside down after a few months because it has no fastener. When the car was new, I just cut the original flap off. I didn't want to glue it up because the entire mat snaps in place without glue.
Before I perform surgery again, is there a better idea?