71 Dart A/C car heater issues

str12-340 said
mounting screws for the AC vents go through the two holes on the top of the vent assembly from the bottom. If you need more info post and I will get you some pictures and one of the right screw.

is there supposed to be a “tab” or something like that on the dash side? So something can screw into it? Or is it meant to be a bit and bolt?