Some of those original limited units occasionally show up in B/S/T. Unfortunately for you, you just missed a couple.
Now the parts are available for sale atDat2zip's Sandwich Shoppe in the McLux Build Your Own Flashlight section. You will need some decent soldering skills to manage this, not to mention a soldering iron. /ubbthreads/images/graemlins/smile.gif
Occasionally, some models made by various individuals show up in B/S/T. These units can be differentiated from the original run by the lack of the TK designation. Some members without the necessary skills and equipment have successfully recruited others to build one for them. Needless to say, there was a fee involved. Since I haven't gone this route, I am afraid I cannot be of more assistance.