im looking for the option sheet for a 71 stwgn. did they come under the seat as well as the other chevelles???

Assuming U are speaking of the build sheet, there are many places they were hidden, go to Tech archives and U find all the hiding spots,, L89SEDAN

In one of my chevelles I found the build sheet under the rear seat and another I found it under the sound deadening mats under the carpet. And a friend found his above his gas tank! They shoved them everywhere, cuz those cars were just moving along on that assembly line.