Dual exhaust manifolds for 1969 442 and Hurst Olds.
In 1969 these cars had exhaust manifolds with the heat riser valve installed on the driver side. 
Left hand driver side manifold, W, is stamped with the part number 402295.
Right hand passenger side, Z, is stamped 402294.
These manifolds will also fit onto any Oldsmobile big block 400, 425 and 455 in any A body car or G body.