81-85 12A Rx7 Carburetor Spacer & Gasket (1480-13-220C)
Plastic insulator/heat shield under the carburetor.
Buying this spacer or a carburetor rebuild kit is the only way to get the gasket, it is glued on firmly.
Will also for for 79-80 12A rx7s if you don't mind re-routing your vacuum lines.