Set of nuts and Ferrules for thermactor smog tubes on any 1967 S code 390, 1968 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 or reproduction smog tubes. Fits most FE engine applications that used the air pump smog system in 1968 with manual transmission. We also have the smog tubes and other hardware.