all buttons are longer than the backplate. Even on stock halos the on/off button stick out into the hole cut into the backplate and you can break it off if not careful when taking it out or putting it in.
I dont see why the cheetah board would make a longer button if it is a drop in replacement to be used in halos. Then again, Ive never seen one so I could be wrong.
The rubber buttons dont come off easy. They can however be installed a little bit further away from the board to allow more room for a longer button. Try to post a pic of both the stock and the cheetah board buttons to try and show the different lengths, and I will know how much room to account for.
Thanks.