Like I said earlier, Fenix sells a mount for the E11. I think it's made by CAA.
You also gotta be aware of AA lights leaking and completely ruining your light if alkaline batts are used. The Energizer Ultimate Lithiums are what I use in this E11.
I have a "gently used" 4Sevens Mini Quark AA coming in the mail right now. It'll serve as my pocket light. I plan on feeding it a steady diet of Energizer Ultimate Lithium batts as well.
That's my bad man - I didn't even see your post about the mount. The E11 is good, but its a multi-mode light - is the first mode high or low?