for those of us who are surefire fans...
i stumbled upon a good way to mount any standard surefire to the handlebars of any standard bike. walmart sells a $17 bike light which actually sucks. i mounted the light and soon found that it was terrible, so i took the light out, and lo and behold, any of my surefires fit right in. it just so happens that the diameter of the plastic bracket is exactly that of the head of my e2DL, e1B, or e1L. below is the link to the walmart light.
p.s.- the first spill i took knocked the bracket loose. the ratchet device that held the strap in place came loose, but it was nothing a little j.b. weld wouldnt fix.