Shouldn't happen but could have. I know the used the 1970 lower core support starting around May 1969 as I have several of those cars that had them originally. I have seen and documented a 69 Swinger 340 with factory bucket seats also and they were not an available option... wave

The funny thing about science is that if you change one miniscule parameter you change the entire outcome to the way you want it.

JB Rhinehart, Realist

A-Body's RULE!