With the clip side up, you should be able to plug a 20-pin connector into the RIGHT 20 pins of the interface (leaving the extra four to the left open.)
HOWEVER; the reason the four extra pins are there are to allow extra juice through extra traces of the board, so get yourself an adapter ASAP. I've had friends have issues do to only supplying juice to 20 of the 24 pins.
Oh... and.... WRONG FORUM!!!! 😉