These are extremely high quality reproductions of the original 390 GT and 1968-69 428 Cobra Jet valve covers. They are triple chrome plated to an even nicer finish than the originals. They are correct for 390 GT Mustangs from 67-70 and 1967-1969 428 Cobra Jet powered cars, including Mach 1’s. They will fit all FE engines, including 352-390-406-427 and 428’s. Complete with original baffling inside and provisions for factory PCV grommet and twist on breather. An officially Ford licensed product. No more searching for old originals that will fit your needs.