Hi, are you talking about the round black A/C vents in the dash per attached picture? I am not sure if new ACE's still use this style or not. If yes, you can "very carefully" use a pocket knife to separate the whole front face (that has the louvres in it) from the sleeve that is seated on surface of the dash and is attached to the air duct coming from behind.
If you broke the louvres, you may find these parts from Coyote International (on line catalogue), but they won't sell retail. You can buy some Coyote Intl. vent parts from/through Badger Truck Refrigeration in Eau Claire WI 715-874-6811. Nice folks at Badger.
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