Previous KK boards, such as the KK Plus board that I show in this video, were mounted in a diamond shape pattern with one of the tips of the board facing forward. Many new multirotor controllers, including the KK2 board from Hobby King, are mounted in a square pattern with one of the edges of the board facing forward.
This video shows how you can use a low cost, effective adapter plate made from glass fiber to mount the new type boards into a frame with holes that are already drilled for a diamond shaped mounted board. The adapter plate I use in this video is available from GoodLuckBuy.com but you can always make your own. I also show how you can mount the adapter onto your multirotor with a tupperware type cover to protect the board.
Enjoy and I hope you learn something new!