You are missing: A) Your cup holder B) Your fog light switch OR Coin slot
The existing button next to your parking brake is in fact the convertible top switch. The printing on the button has worn off over the years so it looks blank. If that button isn't working then you have one of a few issues. The switch is broken or the harness/wiring is bad somewhere or there are mechanical issues with your convertible top. I would start simple and test/replace the switch and then go from there. Here is a link to the switch
The small slot that is empty is there for your fog light switch IF the original purchaser of the car got the fight light option. If the original owner did not choose the fog light option there will be a coin slot in its place. Here is a link to the fog light switch
. There should also an existing harness/wiring to plug into as well if that option was chosen. You can also run your VIN number on the Ford ETIS
website to see if that option was chosen for your vehicle.
The cup holders are difficult to find from retail vendors. You can find a bunch of them on ebay though.
Here is what your interior should look like when the proper accessories are put back in. Keep in mind this picture has the fog light switch and not the coin holder.