Yeah, the only extender I see is for the wider cable. There is a cable adapter but I don’t think that will help things in this situation. It lets you plug the Zero camera in a full sized CSI on another full sized Pi.
Is that the right size? The Pi ZERO CSI is smaller than the one on any other Pi. Except the Compute module, it has those same smaller connectors and needs adapters to connect a display or official camera module.