where to get fasteners to put car back together

MO 1405 1964-65 Plymouth Barracuda (2-Dr.) (141 Screws) 52.90
MO 1815 1966 Plymouth Barracuda (F/B) (171 Screws) 60.25

Where did the extra 30 screws go between a 65 and a 66 Barracuda interior?