These "Z" connectors only have a locking ramp on one side of the connector's pins. See secondary photo for detail.
They still have a tight fit and work great for connecting two .156 female connectors.
This 24-pin connector can easily be broken down into smaller segments when less than 24 pins need to be connected.
Suitable replacement for all solid state electronic pinball machines, especially Data East, Sega, & Stern.