Where is the window regulator safety relay for 1964 ford thunderbird?

A 1964 Ford Thunderbird does not have a window regulator safety relay in the modern sense. Window regulators in those cars were purely mechanical, not electrically controlled with relays for safety features like those found in later vehicles with power windows. There's no such component to locate. Any issues with window operation would be due to mechanical problems within the regulator itself (cables, handles, etc.).