That is custom one off.
I remember that style being pretty popular in the 80s. Known as a bit of a pain as to put one on it had to be a warm day when the fabric would stretch enough to get the snaps to reach. And rain would just pool on the cover, sagging it, allowing more rain to pool. Hence Tasker's upgrade with the arched brace on his.
Another thing that points to one off, it fits around the roll bar. 100% of the bars are aftermarket, and there is no standard of exactly where that kicker brace goes. So to fit the bar for your Bronco, it could only be a custom made bed cover.