Set of thermactor smog tubes on any 968 390GT, 1968 GT-E 427-4V, or 1968-70 428 Cobra Jet engines. Mercury Cougar and Ford Mustang, Torino, Cyclone, Ranchero, etc. These will work with original 390 or 428CJ cylinder heads drilled for air injection smog system from factory. Fits most FE engine applications that used the air pump smog system in 1968 with manual transmission. We also have the ferrules / nuts and other hardware.