Vent Outlet: Dash Firebird 70-81 ++These roller style vents are installed beneath the dashboard on various Pontiac models from the 1960s and 1970s, primarily those equipped with factory air conditioning, though they also serve as premium vents on other models. Each vent measures 128mm from roller edge to roller edge and is supplied individually with a polished chrome finish. Fits but not limited too: 63 Most factory AC cars 64 79 Pontiac LeMans, GTO w AC 71 79 Ponitac Grand Am &