As far as I can tell, this board seems to reverse polarity where pin 6 on the black connector is the common "ground" (for lack of a better word) or M– for the motors, and pins 2-5 is M+ for each motor (Fwd/Rev, Back, Up/Down, Length). Pin 1 is 12V and Pin 7 is GND.
Right, I'm going to quote ...

Hey, bornhall did you figure out a way of doing making it work on this style of board?