Dual exhaust manifolds are correct for 1965-67 Cutlass and 442. GM part number "X" 389269LH and "W" 389268RH.
The LH driver side manifold is also correct for 1968 442 but the correct right hand manifold for 1968 is the "Y" manifold (which is not reporduced). It can be replaced with this "W" manifold. It is the same shape and contour and will fit and function properly.
Will also fit any 1965-76 Oldsmobile big block.