These Roller vents are located under the dash on various Pontiac 60's & 70's vehicles.. mainly those with factory AC but others just as deluxe vents.
They measure 128mm from outside of roller to outside of Roller.
Supplied Each.. in nice new chrome finish.
Fits but not limited too:
63 Most factory AC cars
64-79 Pontiac LeMans, GTO w/AC
71-79 Ponitac Grand Am & Catalina/Bonn w/AC
70-81 Firebird With Factory AC