https://camdensuperchargers.com/79-85-12a-lower-intake-manifold-gasket-cm-8031015-
79-85 12A Rx7 Lower Intake Manifold Gasket (CM-8031015)
Don't forget the coolant passage o-rings. Gasket between the 12A engine and the lower supercharger manifold.
intake manifold gasketlowercm