Identify and find a source for an old electrical connector

I am looking for a supply of at least 20 and up to 1000 electrical connectors that will be plug compatible with these old connectors: Original connectors were installed in 1967 inside the Fan Coil Units of my apartment building. They connect the switch to the electric motor. 4 pin, each has one wire Suitable for 120 Volts AC the pins are flat metal that bend back there are two parts of the connector which fit together