[BONES]

In 1968, some of the chevelle's and el camino's assembled in March till the end of April 1968 were equipped with buick and oldsmobile interiors and are noted on the body plate under the hood. It will be the chevrolet trim number followed by either the buick or oldsmobile trim number.
765-158 buick bench seat (765-chevy) (158-buick)
766-178 buick bucket seats
765-980 oldsmobile bench (cutlass supreme interior)

The olds interior option was primarily found in the 68 concours spt coupe optioned cars, production of 8307. I think there were 3 cities that had the strike in 1968 - Baltimore, Kansas City and I can't remember the other. I don't know about the strike in 1969...