This sale is for a very hard to find Mamiya M645 Motor Drive Connector. This is the part that connects the M645 motor drive to the crank connector on your M645, M645J or M645 1000S body.
This connector is often lost, or simply not included by sellers when a M645 motor drive is sold. Without it your M645 motor is completely useless.
Get your M645 motor drive working again!