68 B body ash tray question

[hilogtx]

Hello to all, 68 GTX one 440 car heater delete the other hemi car both 4 speeds made at different plants. The 440 car has a front ash tray door that slides downward to open the hemi car front ash tray door opens like a drawer what the puck why the difference?

 

[Moparparts]

Manufacture plant or build date, both types where used in 68

 

[hilogtx]

Manufacture plant or build date, both types where used in 68

Thanks for the info any idea as to what plant put the 2 types in and which one was first thanks.