Hi, I'm in the middle of a 79 Camaro restoration project and already have all the dash parts apart. When it came the moment to re-install i realized there's a rectangular section on the bottom of the lower radio panel which paid my attention. This car came without A/C, so only heating /ventilation. What is supposed to go there ? Is there the ventilation outlet that goes to the center console, is there a map light ? I looked at the exploded views, but it didn't give me any clue about what goes there yet. I just attached a photo for clarity Thanks!