I have three of the TR12's designed to work with the Klarus XT2C as can be seen here:-
http://www.klaruslight.com/products/Accessory/93.html
I also have three of the TR11's suitable for Klarus XT1A, XT1C or XT2A as can be seen here
http://www.klaruslight.com/products/Accessory/92.html
They are all brand new in the box never been used.
I have the ED10 for my XT11 and all I can say is that the quality and performance are excellent.
$15-00 each included shipping to CONUS. First I'll take it followed by Paypal payment within 24 hours secures.