The story: My 67 GTA was sitting out dead in western Oklahoma for more than 30 years. Mice ate into the headliner, seats, carpeting, and both these AC outlet air adjusters. OK, looked into a Nationally known Mustang parts catalog for these easily replaced rubberish disks. None to be found.
Yep, you can buy the entire outlets for more than $200 for each side.
well, my Purdue engineering grad nephew has the solution: 3-D printer!
As you see in the photo, the mouse eaten pair, and the new printed ones. Need a set? PM me for the address etc.
$40.00 a pair