You know what. The link I posted above is to a dead thread. Let's move the info here as this seems like a good thread going forward for this light.
Ouchyfoot discovered here that the $2 extension tube from CNQG fits that the light. He also noticed this $2 AR Coated Lens fits. Here is his picture from the above linked thread (Post 61).
I have one of these lights on the way to me. If it can take "C" cells, I will use Ouchyfoot's extension idea to make a 4 C Ni-Mh light for my father.
Here is RaceR86 MT-G2 mod thread for this light.