For every box blade I have seen the teeth are the same size. Most have notches on the front portion that lock on the frame and secure with a pin from the top. The other type have holes in the middle that pin in from the sides. Look at your BB and see if it has option to put a pin in across the scarifiers and if so buy the ones with holes other wise it is the notched type. They are all the same size and should be available from your local tractor dealer or from Agri-Supply.