I am putting together a car whose interior I received in a number of boxes. I am at the point where I am installing the dash center A/C vent into the dash, but do not see how the metal vent assembly is supposed to be secured to the dash pad. I do have 2 small u-shaped clips, each with one screw, that were in with the vent. Are they the right pieces to secure this, and if so, in what way do they install. I don't see any obvious clues.