I have a mystery helmet, and my measurements for both teeth match his. So, for what it's worth, here's what I measured for the width of each tooth base:
Right: 9 mm
Left: 8 mm
REMEMBER: His diagram defines "right" and "left" with the helmet facing you. So what he indicates as "right" will be your left side if you were wearing the helmet.
The bottoms of the face on either side of the visor...
Edit: Thanks Jimmy
REMEMBER: His diagram defines "right" and "left" with the helmet facing you. So what he indicates as "right" will be your left side if you were wearing the helmet.