i recently looked at both my chevelles under the dash and noticed they both had a different heat box seperator.

1-- is a square box with slots (bench seat car)
2-- is a larger unit with curved vent exits (console car)

are these boxes correct for there application?
or is one been changed at one time?

see photo (photos came out blurry because i took pictures in the dark)

http://i165.photobucket.com/albums/u68/danvil1/carparts124.jpg