By the way, I remember in Carl's 4070 thread someone mentioned that they really liked the 4070 headband compared to the regular lambda series ones. I called Yama's Inc today, and they said that there were different screws involved, so they won't fit normally, because one housing is made of aluminum, and the other of plastic. However, they also said it'd be pretty easy to mod them in order to let the headband fit, since it is still the same exact size. The headband itself costs about $200 USD.