I like those - I went totally bakeware on mine though. Not sure I am happy I have done this - but we'll see... LOL. I did this several years ago, and Bronco has been in "disassembly/reassembly" since ...
I "Borrowed" a couple of my wifes Calphon banana bread pans, cut holes in the kick panel, mounted break pans behind (exterior of kick panel) with some sealer and sheet metal screws... I don't plan to run 6x9 in there, but the hole is 6x9 - I expect to use an angled adapter plate and run 6.5" or 5x7" - but a shallow 6x9 will fit.
Not done lining them with Dyanamat nor installing speakers. The "gooey" stuff at the edge is Dynamat Extreme placed between the bakeware and the kick panel. The rest of black bed liner stuff stuff is Raptor Liner
Passenger side kick panel
Passenger side kick panel view from outside
Drivers side