Wiper Motor

If you lay them side by side, they look identicle except for the wiring length and the number stamped into the motor housing. Since they mount a little different, I suspect the park setting in the gear housing is different but I haven't opened them up to verify. They both will bolt up to either year car as I just tried it. The '63 motor mounts directly to the firewall where the '64 mounts to a stand-off bracket that is welded to the firewall.